I got rid of the sun-damaged steering wheel that was torn and had holes in it, and replaced it with a steering wheel that came from another 1980 300SD that someone was parting out. That car looked like it had hardly been used and was in near mint condition, even the original paint! The seller only wanted the engine to put in an off-road project vehicle. I also removed the nearly mint condition dashboard and console to install in mine.
Since the steering wheel has hardly any wear and is in near mint condition (other than some black marks on the horn pad) I bought a steering wheel cover to protect it from getting worn or sun-damaged. It was my first time installing one of these. This is the Superior 58-0470B Sport Grip Truckline cover made for 16"-18" steering wheels. It wasn't easy and I didn't like the way the instructions showed to tie the ends of the lace, so I improvised my own way, which appears to be seamless.
I also installed a new zebrano shift knob. I tried to order one but everywhere I checked said they were all a few months out on backorder. Then an NOS German-made knob came up for sale on eBay for less than the new ones. I think it may be better quality than the ones currently made. I have plans to purchase a zebrano wood instrument cluster when I have the money.
The 1994 Kenwood CD player had quit playing CDs and my antenna is broken. I installed a Blaupunkt Bahamas CD/MP3 player, which is what I have in my 1968 200D. I think it suits the car very nicely and it is a very user-friendly unit. It is also a Bosch product and matches the factory Blaupunkt anti-theft warning decals on the windows. When I was at Pull-A-Part I scored a brand new set of Pioneer speakers out of a 1980 300SD that fit perfectly in the dashboard! They have great sound as well. My car had deteriorated JBL speakers up front. My sound system is great other than I need proper fitting rear speakers.
I purchased an early 1980s Sony Walkman WM-10 for $200 that was advertised as working. It arrived in non-working condition but I will be getting a partial refund and I get to keep the unit. I had planned on putting it in the center console and using the auxiliary adapter to have period-correct tape cassette-playing capabilities. That same day I found a working 1980s Sony WM-4 for $2 at the thrift store, so that was some comfort. I am going to use it in the center console while I look for someone who can repair the WM-10.
I went to Pull-A-Part and saw a W116 behind the fence. I came back a couple days later and they were just setting it down in the yard (a 1980 300SD, no hood ornament--they must remove them before putting them out, along with the fog lights, first aid kit, and fuses). It had 5 great bundt wheels with good tires on them, but there was a crowd of people wanting to buy the wheels so they could pull the tires off of them and junk the wheels. Once they saw I was interested in them they backed off but more people would keep coming by and asking if I wanted the wheels. After I got them stacked up I noticed that the forklift had bent and gouged the insides of the wheels and cut the sidewalls of the tires.
I got the oil cooler, air cleaner assembly with bracket, 5 injectors that look rebuilt, battery tray, fuse box cover with fuse diagram, front rotors, instrument cluster, wooden ash tray, new Pioneer front speakers, rear speaker covers, one door seal, grille, upper bumpers, wheel center caps, German Osram bulbs, and some other pieces.
I like chrome wheel arch trim so I purchased the TFP clip-type fender trim. It came without clips, had scratches, and wasn't close to fitting so I returned it. I later bought a set of chrome-plated brass fender trim that is older stock but made in Taiwan. It had a great finish but was nowhere near close to fitting and I actually kinked one of the pieces trying to fit it. I looked around for German Autotrim Accessories brand fender trim but it seems to no longer be available. I got sick of looking for quality fender trim so I just bought a set of NOS 1980 stock German-made trim (yes, the sets that go for $490 plus shipping on eBay). I am waiting for it to arrive and will install it soon.
Also, I plan on purchasing some tobacco brown interior parts soon to two-tone my bamboo interior. I am going to use the brown door panel inserts, center seat sections, piping, seat net panels, headrest sections, and under rear windshield carpeting. I need to locate some bamboo seat skins that are in better condition than mine since the outer sections of my seats have tears and sunburn. I also need a rust-free rear seat with good padding. Mine is rusty and was reupholstered using nails to hold the skins in place! But, it was a $12 seat at Pull-A-Part and looks better than the blue W123 seat that was in there.