The previous owner of my '87 Steplift removed and refinished the swim step. *He didn't put it back before selling it to me, but it's just as well as I'll be putting trim tabs on and there's no room for the platform also. *As you can see, the angle of the edge that meets the transom should match your V-20 well, if not perfectly.
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Similar platform new is $120 in one of the major catalogs. *Asking a nominal $20 (roughly a case of beer) ;D plus actual shipping cost via UPS. *Lower 48 only, please.