Hello John,
The rear locker lids on WB107 are secured by a length of 10mm stainless steel rod passing forward to aft through holes drilled in the lid ends and in the locker coaming. A stop washer is welded at one end and a hole drilled in the other to take a small padlock. On the underside of the lid a length of pipe is fastened to guide the rod. (Instead of pipe a couple of fairleads would probably do.