17 or 18 inch wheels

Looking for options. Saw a set of Mustang Bullet wheels and wonder if anyone has tried them and if so were there any issues. Thanks in advance.

If you mean the modern Bullitt Mustangs, you'd probably run into an issue with offset/back-spacing. In other words they'll bolt on, but the face of a modern wheel is almost flush with the lip and tire (positive offset), so the bulk of your wheel will go inwards and interfere with brake-lines, frame, etc. Old-school wheels have more negative offset also known as "dish" which is a better fit for our suspension geometry and the position of the mounting face.

Basically if you want it to look right you have to find a wheel that's the correct size, correct bolt pattern and correct back-spacing, and also fits a decent tire. Can be very challenging.
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Thanks for the info. The current wheels have about .866 offset as you describe. They seem to fit well but I was trying to get a little more tire under the rear. I guess I will have to measure and see what I can come up with