No, the asterisk in the parts catalogue denotes that this is a new part, not used on any Rover model before. As far as I know, it hasn't been used on any model afterwards. Obtaining another one might be tricky, and swapping for the standard setup involves swapping either the pedal box or at least removing it and modifying the lever arm.
You might be able to use a pedal from a Jaguar XJ6, but it won't have the two 'guides' at the back and therefore will tequire modifications to the lever arm. However, it algins with the floor mounted bracket so you'll be in the clear there.