Is it possible that o-ring is only for a 2006 and earlier? Is that SE plate also for pre-2007 engines?

 

From the website:

Fits '06-later DynaŽ and '07-later SoftailŽ, Touring and Trike models. Installation requires separate purchase of Cam Service Kit P/N 17045-99D and Drive Gear Retention Kit P/N 25566-06.

 

The cam service kit is a gasket kit

The other is just new bolts and washers for the cam and crank. Same as what you removed at disassembly. Service manual does not say not to reuse the bolts. But you need to degrease them and use red lock tite on them.

 

is it for spacing purposes or to center the shaft up maybe? not sure but I would use it