I bought the kit from Mulfab and as you would expect it's very well made. It uses an offset plate on each side with a hole for the leaf spring centre bolt head, with a dowel to fit the axle hole. It comes with new lower plates and the larger U bolts wich came in 'around 2006'.
The reason I'm still waiting to fit this kit is because it lowers the rear by a few mm, and I don't know whether I can live with lowered, whereas I can live with the mismatch of wheel & arch. This also changed 'around 2006'.