Outer Limits 4x4 Board

Hi all
About to do a twin piston caliper upgrade on my Maverick and I have been told the twin piston caliper bolt is shorter then the single piston one.
So can anyone tell me either the length of the twin piston bolt so I can go searching at the bolt shop for a replacement or the Nissan part number to order a set?
Have a trip coming up and will be under the pump to get the upgrade done before I go so want to ahve all the parts sitting here ready.
Cheers Matt

Hay mate i know its not right but when i done on mine i put 2 washers on one of the bolts and everything worked sweet cheers