Well I look at both the service manual and the IPL. The only roll pin they show is the one for the transaxle control on the transaxle. Must be part of one of the fully assembled parts. Sorry can't be of further help.
Personally I don't give away manuals that I have to buy myself. I run a very small shop an things like is part of my overhead expense. I had buy the manual here as I have customers with the X300 X304 X320 X324 X340 X360 series and I needed the electrical schematics which the local dealer will not provide. I havent even broke even on the manual cost yet.