I was on that Vauxhall forum, MIG WEB is it?
I was looking around the internet for equal length drive shaft kits to get an idea of what the were made up of. The example I saw on the forum was two of the cars standard short shafts + lay shaft + some type of brace and that was it....
It got me thinking that surely sourcing another drive shaft and having a lay shaft made shouldn't be
that expensive? Certainly it wouldn't require something as expensive as the gear box above.
It also appears many new cars use this sort of set up to help eliminate torque steer.
Edit:
Here is a picture of what I believe to be a Calibra XE set up:
Top one obviously being the longer shaft w/ lay shaft and bracket. Found these on a guide for fitting them to a Nova.
Random picture showing some different set ups: