new master cylinder or rebuild?

Rock auto replacement master has a 1" bore.

http://www.rockauto.com/catalog/moreinfo.php?pk=309048


This looks a lot like the master I saw a pic of at the parts store yesterday. It should be in today,so if it's a direct replacement alum master,we have a winner winner chicken dinner!! If this master is any good then we wont need to buy stupid adaptors that stress the booster mounting area.

I just got off the phone with my parts guy and this is the exact master he ordered in!! I'll have a good look at it,but he looked into thier warantee return info for me and there arent any returns. Raybestos is a brand I trust as well,thier lifetime pads/shoes are all I buy.