looks much the same to me, don't know where it goes in a Marcos, the one I've got has an extra part on it, do you want me to post a piccie?
I bought it for a future upgrade, cos I've got a Martina I don't have the adjustable pedals the same as yours. Mine are from a Cortina and can only be adjusted by undoing 4 bolts and sliding the unit. The pedals I bought are complete but are electrically operated and came from a car with IRS, I know this cos the rear end was for sale as well. the cable for the motor drive had been cut through so I'll need to source this, but I've got a mate who repairs remote operated windows (which apparently is where the drive comes from) who should be able to sort this for me, I will post details if this works out