Still trying to find a really good shot of the gear linkage, but if you compare the two photos from pages 42 and 116 of 'The Undercover Story' there appears to be a discrepancy - the linkage on 42 appears to be straight rod , but the one in 116 has a distinct upward kink as it passes below the driveshaft. The Porsche layout drawings certainly show a straight rod from the gear lever throught the cockpit area into the engine bay, so maybe the kinked end is a later unofficial modification! I used a straight rod on the 917-10 and that worked okay.
I'll get my anorak...
SB