340 a body mounts

OK here we go have a friend who is slow in his machine shop due to not being able to get the castings he machines. Trying to help him out and want to get some 340 a body mounts made to help out with people looking for them. Whiich one of these are different than the 318? Really confused on this since I just run big bocks. Top or bottom?
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Those are B and E body 340 a pair of.