The bumpstop I made was urethane 50mm dia/ 70mm tall and bolts to the lower spring mount. after installing longer rear shocks I noticed that on compression I was getting close to full coil bind on the spring also I was at almost full compression on the shock. I made a lower bumpstop that mates with the original upper rubber bumpstop to limit max compression.
The urethane is easy to work with, it was left over from a roof top boat loader i think. It was the perfect diameter to sit in the concave of the bottom spring mount, only had to drill 2 holes on the diff to mount them and cut the roller to lenght & set some bolts and lock nuts on a "shouldered" hole in the centre of the urethane...
It's a bit fiddly to get the nuts up in the coil mounts, if I did them again I'd get someone to zap some stiff wire onto a couple of nuts so there was something to grab onto rather than just reaching with ya fingers.
Had em done in an hour or so with measuring and checking.
flex
compression
extension
bumpstop
mounting
The only thing I'd change is to round the top edge so it's not as sharp as it gets close the coil when flexing it up.
Depending on how big the bumpstop needs to be ARB list one for the front of the XL-7 that can be fitted to the front and rear of Vitara's.
Polar_Bear made up a few front bumpstop spacers, I don't have any pics of mine fitted so but here's a shot of his, I can't remember the lenght... maybe 50mm, hows ya memory Polar_Bear? This is with the OME front struts & Calmini strut spacers.
i really should of sorted them out about 6 months ago 
, so i'll make my own at work tomorrow instead 