Hi some general info (after some digging) on Standard Pantera Calipers:
E2TA-2155 83-85 Ranger/Bronco 15/16 bore LH Ports Alum one piece body Rebuild Kit from Rock Auto Wagner MK 106434
72-87 Full size Ford/Merc "Bendix 2229331"cast in bottom NAPA #P 2069 1"bore RH Ports Alum one piece body. Rebuild Kit NAPA#14-256
After attending the AZ Chapter Club Track Day and talking to a couple of the members there it seems that the modern choice might be the:
Wilwood #260-4893 with a 1 1/16 bore LH ports 2 pc construction with a low profile reservoir.
Another variant (but I have not physically seen one) is the 96-98 SVO Mustang 1 1/16"bore RH Port Alum 2pc Flat Profile Plastic Reservoir
If I have something wrong please comment