First off, thanks in advance for anyone help anyone might be able to offer. Due to my limited experience in the area of commercial mowers - I might get a little long winded as I try to explain exactly what the problem is. I purchased a used 36" eXmark walk-behind mower. During the first mow, I noticed a belt (that looked a little tattered) fell off and the mower stopped propelling itself. I took the belt to my local Ace Hardware (which is an eXmark seller) and asked for a replacement. They explained that the belt that fell off, doesn't go with the mower I was describing. The model number of the mower is: 36-12.5k and the serial number is: 41316-119 Those numbers are found engraved on a silver plate on the back of the mower (under the controls). The number on the belt that fell off is: 84340 As I tried to explain exactly which belt I needed to replace, the very patient mechanic searched through several different options and models, but couldn't seem to find one that matched my mower exactly. I might have confused the issue because as I was trying to search for the part number myself, I assumed the mower to be a Metro (because that was the search result that came up the most). He eventually gave me a rotary belt #12-5067 (1/2" x 34"). I was able to get that belt on, but it was extremely tight. When I cranked the mower, and released the brakes, the mower popped a wheelie (and it was in low gear). Once I realized that the belt wasn't correct, I started back at square 1... aka, google search. I finally found what I thought to be the answer to my prayers. I found this website that seemed to list eXactly what part I needed for my mower (assuming I could select it from the tiny drawing). http://www.partstree.com/parts/?lc=exmark&mn=32-12.5K-5+S/N+40,000-49,999+(1989) I went back to the store, and picked up the belt I believed to be the correct belt. When I placed it on the pulleys, it seemed a little loose. The belt worked for the low gear, but as soon as I tried to change into a higher gear, the belt fell off. The belt I bought is: eXmark MFG Co Inc 403018 DF (what is printed on the belt). So my question (I apologize for the long-windedness), is am I getting the wrong belts? Or am I missing something? Or is it possible that someone has altered the pulley system and I need to be looking for different belts... After a week of this, I'm at a loss - short of sending the mower to be looked at by a professional... I'm just one of those strange breeds that likes to learn so that I will be able to maintain my equipment in the future.