This is for a Lazer Z Advantage Series in the 681xxx serial number range. Model for the mower is LAS28KA524 I'm trying to determine the correct eXmark part # for the wheel (rim only) that takes the 24x12-12 size tire. When I look in the parts manual that I downloaded from eXmark's web site, it says the part is 1-633993. However, in some searches on the web I see some places are listing 1-633992 as the correct part number for the rim that fits the 24x12-12 tire. For example http://j-thomas.com/Catalog/069_exmark_lazerz_main_frame.html But then if I look at partstree I see this: 103-2744 (replaces 1-633993) Wheel (60" & 72") Now it gets even more fun. If I go to eXmark's web page and click on the parts lookup http://www.4emweb.com/partsearch.asp I get this part number: 1-633993 Wheel (60 & 72). [Qty 2] This is confusing the heck out of me. I assume exmark changed the part number because if you search exmark's parts site the 1-633993 part is now showing up as a tire, not a wheel. Do they change the part numbers every 5 minutes? LOL Here's why I'm asking. The Lazer Z AS I have is the full size Lazer (with 52" deck) just like the regular Lazer Z (this is prior to the 'Next' Lazer Z, I have the older model not the new Next Lazer Z). As far as I can tell the only difference between the model I have and the models with the 60 or 72 inch decks are things like the larger drive tires/rims and a few other very minor details. I want to get the wider rims/tires for the rear. I am buying the 24x12-12 tires from another source pretty close to home. I just need to get the correct part for the rim so if I do order online I'm ordering the right part. Like I said, the part numbers appear to have changed and it's confusing me. I can't see any reason why these rims won't fit on my model since mine is a near carbon copy of the models that have the larger decks.....right? I even saw an exmark rep telling another forum member here in the past he could buy the larger rims and put them on his Lazer HP. http://www.lawnsite.com/showthread.php?t=68806 Can someone help me with the part number?