im upgrading to four pots as one of my pad carrier slider bolts seized and snaped off..


will the subaru 4pots use the same pad carrier or not?

 

I don't really get your question. The pad carrier bolts are part of the caliper, so if you're upgrading to 4-pots it won't matter that your old bolt is broken. Unless maybe you've actually broken one of the caliper mounting bolts, which would be a whole different problem.
Simple way to tell - is the bolt a 14mm or a 17mm head?

 

not sure its the bottom bolt that goes threw the pad carrier.?

 

If you're not sure what size the bolt-head is because it's broken off, see what size spanner fits over the equivalent bolt on the other wheel. Or maybe take a picture.

 

Can't use the same pad carrier as the 4 pots use different pads

See here 4 pot pads:

SUBARU IMPREZA WRX 4 POT MINTEX BRAKE PADS FRONT on eBay (end time 18-Sep-09 12:27:32 BST)

2 pot pads

SUBARU IMPREZA 2.0i TURBO 94-98 FRONT MINTEX BRAKE PADS on eBay (end time 13-Sep-09 14:41:55 BST)

Can you see the snapped bolt on these pics??

https://www.scoobynet.com/technical-...sc-4-pots.html