At repair center the labor should be 1-1.5hrs X flat rate. If you try this job be careful w/jacking engine as radiator neck is fragile. The part # is 201-240-43-17, try PartsShop for OE quality only!! Have seen aftermarket units that are JUNK.
By the way my 1973 R75/5 has the longer swing arm & only 53K original miles.
[This message has been edited by M.B.DOC (edited 01-06-2000).]