Originally Posted by Cliff S1
You can fit an S2 box in an S1
Mine has an S2 box in mine. The gate as it's called is in the gearbox on the S2 where as it's below the gearstick on the S1.
The S2 box was put in mine and then the bits removed from underneath the gear lever.
Unless there was something done to mine that I don't know about

So what have you bolted the front gearbox mounting to?
You can have an S2 box built up in an S1 gearbox casing with the H gate in the box OR in the gear linkage remote. (S1 has the H gate in the remote, S2 has the H gate in the box).