Yeah, I must admit - I bought the Regal kit for my Astra. It has everything you need, takes 10 seconds to fit.
When I converted my Calibra though, I made my own kit using an old F16 part. Didn't need to have the support bush because the Calibra has an intermediate driveshaft support bracket which holds it steady.
If it's going in an Astra/Nova - I'd buy the kit and have the support bush already there to drop in.