Actually, you really only need one per side. One big one.I use the Southco latches on my lids ordered on eBay. I asked the vendor for "keyed alike" latches and that was what I ordered. I feel the epoxy is only a temporary fix, these latches do not fail. I used aluminum rivets, and I put a small stainless steel plate on the inside of the latching plate to protect the plastic.
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https://www.southco.com/product/class.aspx?cid=7421&ctid=103