Since the original tire size was 185-14 (NLA), what tire size should I get? Is the consensus that 195/75-r14 is best (or at least closest to the original)? The car actually has 205/75-r14 on it at present.

EDIT- And is it a bad idea to shod the car in light truck tires?

I just found the World's best tire size calculator. It actually has 185-r14 as a size you can compare against. 195/75-r14 looks pretty close.

I had 205/ 75/14 in my 123, so the wheel well should take bigger tires.

Yea, this car is shod in 205/70-r14, but I prefer to get as close to the original size as possible.

I found out that 185/80-r14 == 185-r14. They are still available, but only in light truck form. Is there a reason not to use a light truck tire?

I went with the 195/75-r14 Toyo Z800 Ultra. It seems to have much less side wall flex than the 205/70-r14 tires I just took off (of the exact same type). Maybe my tire pressure gauage is off, or maybe Les Schwab inflated them too much (or at least past Mercedes' recommended pressure), or maybe the old tires were just too wide.