new master cylinder or rebuild?

So I bought the rebuild kit today! $36 plus tax and it seems like the best plan. The pistons it came with are stainless,as are the ones in the calipers. Should help prevent sticking. I also got wheel cyls at $10 ea but thier not stainless pistons at that price!!!

My parts guy claims there are no alum master for a 88 Dak,so I said forgetaboutit.