Hi Greg, Welcome to RS and ARS!
Ive added you to the Aprilia usergroup, so you should be able to see all the ARS side of the Site now
As for the rearsets, I'd imagine a search of e(vil)Bay would produce an average price, then add a bit if theyre in good nick! Oh, and get em up for sale in either the For Sale section of this part of the Site (RiderSite) or in the Aprilia Bits for Sale forum down there in the Aprilia RiderSite part of the Site.

(All probably sounds a bit confuddling at the mo, give it time Im sure it'll make sense!!)
"Welcome to the The RiderSites.. RiderSite and it's Evil Twin..Aprilia RiderSite"
(Hey, that's not a bad slogan...

Evil...
Twin.. RiderSite.. Sister Site..twin... Oh FFS! I KNOW WHAT I MEANT!!! Samray, stop shaking yer head..

)