Just had a play with soem old pro4 shocks and some old xray adjustable pistons and shafts, they fit and you still get heaps of down travel. I am going to use xray orings and make up some special spacers to go in the end of the shock body to seal it as the xray shafts are bigger. Internally adjustable pistons hooray. Once I work out what size to make the spacers I will post the dimensions as this would be a worthwhile mod to do to any car.