There is at least 2 extensive threads on many methonds to replace the Oil Cooler Hoses.Repair Links
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Other companies hoses on Ebay UK might get you a better shipping price.
People on that have bought aftermarket hoses have occasionally had problems with them.
If you are reusing your own fittings and replacing only the hose Cohline has the 15mm inside diameter oil cooler hose used on W123s.
Un the USA Bellmetric has the hose only. In Canada ???
I believe Cohline at one time also sold the complete Oil Cooler Hose assemblies.
See the attached pic of the hose part number and size