What's the diameter of the hinge pin? If I recall correctly, the V3 (and earlier) hinge pins (330039) are 2.5mm. They are slightly longer, but that's easily solved with a dremel or by simply using a grub screw in the bottom of those caster blocks
There are also other cars with 2.5mm hinge pins - I believe the Yokomo BMAX2 is one of them. It might be worth looking into other cars for a cheap(er) source of pins...