Assuming you have 18" rims already?
Sounds like the tires you need then.

Old "new" tires even cheap won't always be a good deal. I ran some new never used but 20+ year old (even stored inside) goodyear 8-19.5 tires on my truck and they did fine for about 10,000 miles but then both rears started to loose sections of tread. The tires were free and served me well, but had I paid anything for them I would have been a little disappointed.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-