I've ordered two different ones as I wasn't impressed with the quality of the Dorman one, and they are not identical so I took some measurements with my calipers.
Feel free to add any measurements you can of the ones you have on hand, especially if you have a stock one handy, or access to a snout to get the pin size and spacing measurements before I get to them.
BRAND -THICKNESS - OD - ID - HOLE DIA - HOLE SPACING (center to center)
Dorman - .595 - 1.953 - .762 - .250 - 1.292
eBay - .633 - 1.958 - .752 - .248 - 1.305 (http://cgi.ebay.com/ws/eBayISAPI.dll...m=251483211585)
So the only real difference is the thickness so far.