very helpful folks, thank you. there are 00 40 and 13 40 and though my '77 chassis calls for 00 40, it looks like the one which has now failed is 13 40, presumably because of my engine swap. i guess the 00 40 does not pull on a rod to the side like the 13 40 does.

dutch store with an impressive price on 00 40

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'77 240D, 504H, OM617.952, etc.