John, you'll probably have to fabricate a bracket to hold your spare tire. Beck cars came with the bracket as standard equipement and Vintage also makes the bracket at the customers request.
Straps are available via Fibersteel.com and a few other sources.
Depending on where you live, you could have a welder bend a piece of steel and weld it to your frame or if you have the capabilities, you could easily fabricate such a bracket.