Need a tire replaced on a seed wagon. Nothing fancy, just hold some air for a week with 80-120 units on board. Right now it has a 7.00x15LT tire that has seed better days. Have a 205 75 R15 trailer tire that I kept around, but it looks 2 inches short side by side ( old one still on rim) I thought it would be closer in size. Hate to buy a newone for this job