Hull 503 deck cleats

Last year I purchased hull 503 locally - in excellent condition. I want to replace the original sheet block & swiveling cam cleat (is very crude really, a plastic pulley wheel with no bearings and a simple cam cleat that swivels with it), preferably with deck mounted cam cleats each side in the typical configuration. I am guessing, though, that there are no backing blocks in the locations where cam cleats are now mounted. I can't find any info on this, thought I might ask here if anyone...

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