Purchased from TopFlight Automotive in the USA in Oct 22. Part number MA70445 620 Coil Springs - Lowers Car 1” 650 lb, 1967-1973 Ford Mustang (big block).
Brand new : Ford Mustang Grab-A-Trak Coil Springs.
Unfortunately I purchased these in error as my 1970 Mustang is a small block.
$240