...you have any questions about your frame or any of our parts, please email or call toll-free: 1-888-648-2150. This Oldsmobile frame has been bottlenecked to accept our Mustang II crossmember....
What do you mean, “modify the rails”?
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Dear Welder Series… Mustang II frame width min/max
...SUSPENSION IN 1950 FORD CAR WILL ONE OF THEM FIT paul Either suspension will require frame work, Gordon. Take a look at http://welderseries.com/category/mustang-ii-installed-pics/ and scroll down to the Olds installation....