post a picture of your calipers up... and we might be able to help you id them.
if they are from an r33 gts25t then they would normally have a smooth surface (these are also the same for non-bremb r32 gtr)
r32 gtst will have a ribbed top surface of the caliper
better make sure you know what you have first before getting a vin
EDIT: eh really? what an ass.
when i went in: i just quoted r32 gtst type-m and half a minute later we were printing out the pages, showed him my caliper and we looked at what i needed and how many, how much and when they'd be in brisbane.