I had a question I have a full tubular front suspension and I have a set of sportline springs. I have just really paid attention to some post that say that the sportlines need the bumpstops to prevent the ride from bottoming out. I have no clue on where to pt some bumpstops to keep me from damaging suspension components. what has other with tubular a-arms done about bumpstops?

 

The bump stop just needs to be on there so that it will soften the load gradually at travel end without allowing the suspension parts to ground out against anything it shouldn't be making contact to that could cause bending of failure.

The tubular arms you have should have provisions for a bumpstop of some sort- otherwise they were not engineered safely. every A-arm should have a bumpstop stop provision and should be fitted with either the stock unit or something like an aftermarket Energy Suspension bumpstop. If you fit the bumpstop yet the car is still grounding out with metal on metal -or- the fenders are hitting the tops of the fenderwells -or- the strut is hitting bottoming out on the underneath of the strut mount...... You need to either raise the car with a longer coilspring of the same rate and frequency or go with a higher rate coilspring of the same compressed height

 

You can mount some on the strut shafts. Shim & trim as needed.
http://www.nissanperformancemag.com/.../classic15.jpg
Sorry for the nissan link, but it was a quick find for a pictorial explaination.