Larry, Diesellieber and Mr. Goodwrench,

My '78, '79 and '80 300SD all have parallel (PIN) type GP.

MY '80 300SD has carbide cam followers and I think the '78 and '79 do too.

The '80s and older do not have the Bowden cable for the transmission but you may be able to hook up the original one.

P E H