ORIGINAL: bigbulls
I know your brain is a little slow Mauser
but just take the pro shop of your choice a fletched arrow and ask them to match that arrow as closely as possible.
DUUUUUUUUUUH! 
Yeh, nothing hard about this. They may not be willing to change ther jigs for the mount of offset, but they surely can slide the vanes to the same distance from the nock that you presntly have. All ya halve to do is ask.