I'm getting ready to order a repair manual for my PC05-1 Komatsu, serial #1225, but the website shows both PC05-1R and PC05C. I can't figure out which manual to order, and at $99 each, I'd like to get the correct one, first time. I thought maybe the "R" meant rubber tracks, but, as near as I can figure out, both manuals show rubber tracks, and mine has steel tracks. Any help would be most appreciated.