Sorry chaps, no time for good pics, just this one. That is the stock TA03F Drift wheel, with special compound tyres (damn hard). The inside half is meant to be harder than the outside.
I made my own bumper from 2 pieces of dense foam. I cut away the two knobs on the stock plastic bumper and screw it down with the aluminium bumper attachments off some other aftermarket bumper. Works very well and is very cheap. I have bumpers to suit each body I use, and they cost a couple of dollars all up!