The TR4-4A accelerator pedal part number 209411 has a slight kink in the pedal support, to the right whereas the accelerator pedal assembly for TR2-3B part number 208437 has a straight pedal support. Another identifying feature is the cross bar that goes underneath the brake and clutch pedals which is 4½" wide.

For comparison the TR2-3B part is 6½" wide. For this reason a TR2-3B accelerator pedal cannot be used on a TR4-4A as the wider cross bar hits the bulkhead.