If you're looking for a rare 508 belt lifter there is one for sale on eBay for $20.00 the 508 is the rarest of the 500 series belt lifters.
https://www.ebay.com/itm/224936581672?hash=item345f43da28:g:2ZUAAOSwC-RiV4IC
https://www.ebay.com/itm/224936581672?hash=item345f43da28:g:2ZUAAOSwC-RiV4IC
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