If you have a pan based car, you're in luck. Any supplier that carries interior kits for an Oval Beetle ('55 was a nice year) will have the rubber mats and tunnel kit for sale. They came stock on 55's.
Of course, since your pan was shortened, you'll have to shorten the tunnel mat as well. If your shifter or e-brale were relocated at the same time, then . . . forget it.
Just hit the web and go for it!