
I don't see how a Wilkinson is an "upgrade".
Here's what you want:
Callaham American Standard Premium Upgrade Kit
http://www.callahamguitars.com/partsstr.htm(scroll down page before halfway)
Includes:
* Callaham American Standard Tremolo Block
2006 enhanced
with 3 stainless steel top plate screws
* Callaham "64" Virtual Pop-in stainless steel trem arm with tip comes stock.
Our other 2 length arms can be substituted at no additional cost but you must specify at time of order.)
(Please specify mint green or parchment
white tip otherwise parchment will be sent.)
* Callaham Vintage styled "CG" saddles
for American Standard bridges nickel
(offset intonation screws)
* 4 Tremolo Springs
* allen wrench
Those poopy Am Std Strat block saddles & trem block are made of cheap pot metal (contains zinc, which sucks tone).