The steel brackets differ L & R. The 2 in the ebay photos look exactly the same. I recall a triangular side on only one of the brackets. I probably have photos at home, but may forget to post, and pretty sure you can find them here in a search. You also need to know which side of the block's "ears" the brackets attach to, which several posts discuss. I forgot, but did verify that mine are installed correctly.
"Engine mounts" should refer to the rubber isolators that some people above discuss. I forgot if L & R differ, but they are much thicker than the later "pancake" mounts (maybe 67 - 72). The later can fit if you **** them and drill a hole in a mount (I did), but your engine will sit lower (could be good). I switched back to the thicker mounts.