I want to add aftermarket rear tires (perferably Turf Tamers) & some aftermarket rims (Douglas or itp) . It comes stock with tires 19x7-8 & rims 5.5x8. Any help on what to look for as far as rim & tire size that I can find in compatable lug spacing. I love the AC 90 & it has always run dependably for the year that I have had it but It disappoints me that there are almost no aftermarket products avail . any help with the tire/rim issue would be greatly appreciated.