As I recall, there never was a "real" brand name applied to those clear mat sets, other than what was on the carboard hanger they were stapled to, for marketing and inventory purposes. Many looked similar, with the main differences being the "emblem" in the center of the front mat. Universal fit, too. Few auto supply mats had the exact same emblem, so what was at K-Mart would not be what was at MWards or similar. Many variations.
When the clear vinyl mats appeared locally in about 1968, I thought they looked neat. Being able to see the beauty of the carpet through them, rather than it being hidden by the OEM-style rubber mats of the times. Or the aftermarket rubber mats.
Enjoy!
CBODY67