I want a set of Husky contour floor liners for my '74 to collect the crap in the winter. According to Husky's catalog, the earliest set they have fits years 1980 thru 1997. Is there a difference between 1980 and 1973 that would make them not work? It's been years since I've had my 85 blazer but my memory says they're the same. Anyone know for sure? Thanks.