I paid £100 quid for a second hand fan at a rover breakers. They're rare as rocking horse. Most of the 75's there had front end write-offs, not what you need when you're after a fan motor
That was the easy bit.
The hard bit then was finding someone who could de-gas the air con, strip the front end of the car down, swap the motor then re-gas air con. The air con pipes run through the fan cowling, most ridiculous design I've ever seen.
I *SWEAR* they build things like this on purpose !
So I thought sod that, what if this second hand fan fails after six months ?
I went to MGR and coughed up
Still, it bought me peace of mind, I can sit in traffic now not wondering when my second hand fan motor will fail.