Reddtarga
I don't know whether you know it or not but there were several different 'slimline' shape boosters used.
Maybe best to look for one fitted after 11/93 - they are more powerful than the ones fitted after '92 when the larger brakes first came in.
Thanks for the info.
I did notice lots of different part numbers on various slimline boosters.
I was told that the most important thing is for the booster to be the slimline shape, but I should look for the latest one I can find.
Reddtarga
Also with later boosters they put the check valve on the intake manifold and not on the booster itself, so you'll also need a 10 mm check valve.
Thanks for that. I heard something about the check valve but I didn't know any specifics.
EDIT: I saw some part number diagrams of the brake booster and vacuum lines for the early and later model SW20s, and I could see that the check valve only exists in the later model diagram as you described. It looked like it would be located on the firewall, not so much 'on' the intake manifold, but either way it should be easy to confirm so I'll have a look tonight and confirm if there is no check valve in the engine bay of my car.