Depending on what the upholstery shop charges for mods, this might be a time/cost effective solution. From Australia so there's some shipping involved but I really liked the molded feature with the built in heel pad.
https://www.ebay.com/itm/112410920454
I have one of these ZT-101's aftermarket delays from the '80's in my 510 and it works well. Still available from time to time on ebay:
https://www.ebay.com/itm/225173123154?hash=item346d5d3052:g:nVAAAOSwoRJjK7k7&amdata=enc%3AAQAHAAAAoN5QePlrY35n%2BXs9isoP6%2FkZIup%2BXDNaZnEJBhZcwG77X34FZnPQazxLI6JHeF%2F0PrYBP2LSPnq4fkL6osNc%2BhVQ8%2FEAULE5K8vvcEXMw1oaigUiPgOMhwiC2GJ4PCwViitHRny6hGrDv4hgPiltJqmXnkHsFTlUwDoXYzE3VM5FJtXxgi9rJCTjRhUtEtxDE0ijk9XHZMGUaOp59B%2BQddw%3D|tkp%3ABk9SR6Cj5K6wYQ
Would adding $5 to the gate cover the additional costs? No one would mind paying a bit more to support the community.....can't even get a gallon of gas for that these days.
0.1" of Oregon rain on Saturday?...It'll be nice half the time with a few drops here and there if the forecast holds out. Only concern is mud from Friday's rain. Should be fine.