[camarojoe]

There was a 2 spoke rubber wheel offered as an option in 71 ( and maybe 72 too) that is likely what that 1975 parts book is referring to. It's a fairly obscure wheel and I don't have one to post a photo of, but I'll bet it has that 131 part number you are concerned about... It wasn't offered in 70, but was probably just incorrectly listed in that 75 parts book.