front split bench seat covers

Where do you find these, fabric Front Split Bench Seat Covers for my 71 Duster.

My Duster has vinyl seats which can produce 2 and 3 degree burns in the Phoenix summer. The interior temps easily exceed 180° in the sun. I need to cool that off some


I found them in the Classic catalogue for well over $400.

I am looking for the inexpensive covers, usually less than $50.

Any assistance would be greatly appreciated.