Wheel Cylinders posted on ebay are incorrect, well most of them, as some have pointed out, some of the more recent ones have the incorrect bore diameter.
well I purchased two left side cylinders back in january, inspected them, but not enough, as it turns out the following
http://www.ebay.com/itm/M715-Jeep-Gl...f3615b&vxp=mtr
is incorrect for our trucks, they have a 1-1/4"bore, are longer, and the bolt holes don't quite line up. I have since contacted the seller, and figured I would post a heads up here, in case anyone has ordered recently.
as I told the seller, the FSN for our trucks is 2530-933-3584, left; 2530-927-3316, right. his FSN for the left cylinders are 2530-889-1668
in fact he happens to have several new stock cylinders for sale, but they are also incorrect. don't want to judge him too much, but more research before a sale should be considered
hope this helps someone...although not in a great way