Piston question

[Sonicman]

I have an 69 c10 with a 250 inline 6 and had it about 2 months. I am rebuilding the engine. Well my buddy and I were putting the rings on the pistons and he dropped one and cracked the side. Now where can I find one. We took it to a local machine shop and they said it didn't look like the original piston and that it is bored .060 over. This is my first rebuild so I'm clueless. I've looked at pics on ebay and seen pistons to a chevy 350 that look like my pistons and are bored .060 over.

Can someone please shed some light for this newbie.