The rusty ones came out of 3089R which had a leaking screen. The pedals were rusted solid, but as it is now RHD, that was no problem.
I had to drill the bolts holding the sliding seat mounts out from below.
The new ally ones go in 4688R which is my "keeper". The steel seats from 4688R, which were in good condition, go into 3089R which is at the paint shop.
The interior trimmer is on set #5. I am a better customer to him than the Lotus factory just up the road. I pay quickly !!!