On Oct 10, 2024 John T. in Whitewood, SD, USA wrote:
"Two parts cars. Two sets of pedals. One was a 1500 and one was a 1600. MGA's. Why is one set one inch longer to the foot pads? I decided on the shorter set which is what is in my other MGA driver. The reason: When you release the brake and go for the gas, the longer set's pad is right next to it and I may hit both. Or worse, you go for the brake and also hit the gas".

Brake & clutch pedals were modified on 1500's late in 1958; could be the reason you have two different measurements.

Nov 58 -- Pedals -- Brake pedal modified. Clutch pedal on LHD cars modified. Com (c)58713
Jan 59 -- Pedals -- Clutch pedal on RHD cars modified. Com (c)61100