http://www.gearboxman.co.uk/psgearboxes.html

Prices are on there.

I have a stage one box from Bernie (Gearboxman) in my RST and have had no problems at all with it. Prior to that i was breaking more boxes than trips to the petrol station

As above, dont drive it all though it may be too late and need a mainshaft aswell.

See here for some more info...

https://passionford.com/forum/viewtopic.php?t=314807