take a chance!
Matt,
While the wash arm support on Ebay looks pretty well used, as long as the pin and ring are in place and the internal white bushing is tight, then you should be okay. What is very important as well is the "squareness" of the bottom of the support. It has to sit flat on the lower pump housing in order to seal properly. If it doesn't then water can spray out of it and affect the pressure going to the two wash arms. It is hard to see the water leaking as it is covered by the strainer but it would be obvious that either your current one or the new one was not square by simply running your finger around the perimeter of it.
If the wash pressure seems lacking, you may want to check the wash impeller to be sure it is intact and that it is shimmed properly. If the space between the lower pump and the impeller is too big, you will not develop the proper amount of pressure from the pump. There are specs for this clearance and usually, a new seal kit will include the shimming gaiges as well as spacer wahers that take the place of the upper support when shimming the impeller.
Hope this helps. If not, give a holler
Oh!! and btw, if and when you remove the upper support, make sure to replace it with the word "front" facing in the correct direction. If it is not in the right place, you can restrict the water that would go to the washarms.