The Ultimate Racing Body Mount Dual Lock Tape, and is intended for use with all RC cars.
It's not really velcro, though -- instead of hooks and loops, both surfaces have these tiny hard plastic mushroom-shaped things that grab each other by the hundreds and don't let go. Both sides are the same, so there is only one tape (called self-mating). This package includes 2 pcs of 15 cm.
Warning: Last items in stock!
And unlike the loosy-fabricky velcro connection, the Dual Lock surfaces don't join until you've positioned them exactly, and then pressed them together with a satisfying "chunk."