Wider steelies for my s10 frame

[41_rat]

Hey
New to the boards, and I have a question.

I'm currently building a 1941 chevy pick up on an s10 frame. It currently has really narrow rims and tires. I would say the rims are 15x6" maybe even 5". I need new tires anyway, so I figure I'll get wider wheels. I have the red steel rims with the small moon center caps. I would like to maintain this look but with a more aggressive stance. Something like a 16x8 all around. Where can I find steel rims for my truck? Also what specs do they have to be. I have read some threads about back spacing, and I just want to make sure I buy the right size first time around. I am relatively new to the Gm building game and I'm learning more and more every day. I believe my s10 frame is a mid to late 80s frame.

Also if someone could tell me where to find the serial number and how I can find what year my frame actually is that would be great help.
Thanks in advance
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