How do i figure out what wheel sizes will fit my 69? will wheels off a new mustang fit? Will 17 X 8" WITH 30 OFFSET AND 5-114.3 BOLT PATTERN fit? Thanks

 

Fit what? You haven't told us what year Mustang you own. I can tell you that if you own a 1965-1973 Mustang, that the modern Mustang wheels will not fit because of the back spacing limitations you have. Here is some reading for you.
Tire and wheel fitment charts:
http://dodgestang.com/mustang.htm
http://www.allfordmustangs.com/Detailed/658.shtml
http://mustangmonthly.com/techarticles/mump_060100_wheels/
http://links.vintage-mustang.com/index.html?faq

Wheel and tire technical charts- backspacing, bolt pattern, etc.
http://www.rsracing.com/tech-wheel.html

Wheel options and fitment chart:
http://www.stanginfo.com/Wheels/WheelOptions_view.php

 

thanks for the quick reply. I did post above that i have a 69. Thanks for the reading info, i will read up on it.