Hi Garrick,
The wheels will fit your '58 MGA. All MGAs, except the twin cam, use the same spin-on wheels if that is the option. Do note that these are just the wheels sans tires. I just bought new tires online (Amazon) for $47 a piece. These are getting hard to find and the Nexens that I have on my car work great. Check out the link here: https://www.amazon.com/gp/product/B004QL6ONQ/ref=oh_aui_detailpage_o08_s01?ie=UTF8&psc=1
If you are interested in the wheels, let me know by sending me an email and I will set up the meeting. Cheers - Bill
