The below cage on a "Comp Safari" motor i had came from Whitbread. The truck had had an "Endover" roll before i had it and was fixed. The guy i brought it off, was amazed at how little damage to the cage structure had occurred. The hole chassis and caged was checked for deformity but was good.
Whitbread were at "Old Sodders" in October. Selling ext or int cages. Pre-fabbed, bent front and rear hoops. Personnally they look very good qaulity and are CDS. Prices were from 275-375 self install or from £500 fitted.
The piccy below is the one im going for on my 90 pick-up (excluding front fender to bumper sections)
6 point cage, standard ARC,MSA spec, nowt flash, but it is very popular choice.
They supply 6mm plates to put at each place the tube meets the chassis. The use of a welder and a few fitting skills needed. Looking at the job ahead, check to see how good your outriggers at the front and center and rear cross members are? No point in sticking a cage on to a truck that has been attacked by the dreaded "Rust Bug"
Hope this helps?
Search eblag, they sell a few on there.