I run a thrift shop and I got in two sets of Avid Racing AC.MM.001 Billet Aluminum B-series motor mount kit for 88-91 Civic/CRX and for some reason there are only 3 of the 4 mounts in each box. Is there some reason why the same would be missing from both boxes? Maybe that is the one that wears out more? Would anyone want the 3 mounts I have? Thanks for your time.