Dull or satin finish blades were a federal mandate for 1966 production vehicles. The 65 should have a polished stainless blade holder made by Trico. The blade holder would have been flat on top vs. the 66 and up "peaked" style holder. Some early 66 GM vehicles had a flat blade holder with a beaded or blasted finish on top, rather than the later brushed style. From what I've read Trico modified an existing supply of 65 and earlier style blades to be federally compliant for 66 and these could be identified by the somewhat polished finish on the underside. Anco was a major supplier in the aftermarket.
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