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NDP used to have them...but they don't carry them anymore and the vendor apparently does not exist anymore either.
Mine are rusted pretty bad so I want to replace them...
thanks for all your answers! Following Bill's link I would these Carr Steps that look pretty good too and would match my 77 truck pretty well:
Unlike a lot of other contemporary ones these have no rubber or plastic pieces and have a nice round line, not a cheap-looking, square aluminum design. A good fit for a classic truck.