The later GT5 and 5S calipers are a different pad pattern than the earlier Ford era Panteras.
The fronts are the same as early Aston Martin V8 and the rears are the same as early Jaguar Series I/II/III XJ6/12 sedans.
Here is a cross-reference to source GT5S front and rear pads:
Front Pad (122mm X 73mm X 19mm)
Girling 64 325 839
GDB 503
EBC DP2223 (223 series)
Hawk HB 106
Rebuild Kit Girling SP 2577
Rear Pad (80.7mm X 66mm X 15.2mm)
Girling 64 325 738
GDB 521
GP97 (same as early Jaguar XJ series)
Mintex MGB521
EBC DP2101 (101 series)
Porterfield GD 557
Ferodo 2430F FF64R
Rear Brake Pad Pin Kit Jaguar JLM-1539 (vented rotor)
XJ12 Brake Pad Pin = 12798; Clip = 11369
Rebuild Kit Girling SP 2524
Good luck,
Julian
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