1970 Fury III disc brake caliper dragging

The driver side caliper has been dragging the past few times I had the car out. I cannot seem to find a replacement anywhere.
Car sits, more than driven @ 2000 miles a year. Factory front discs, all brake parts hoses , rotors, calipers ( factory dual guide pin style) replaced @ 10 years ago. It has been mentioned that I should
change out the spindles to the newer ( 80's) version so parts are readily available. Wondering my best option , long run, or is there a caliper out there to purchase...

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