I have never seen that thing, didn't even know it existed... Tamiya is the king of reuse though, to there must be a common chassis to help you search for parts.

Here is the link to the truck on Tamiya's website. There is a hop-ups and parts page on that link.

[link=http://www.tamiyausa.com/product/item.php?product-id=43534]http://www.tamiyausa.com/product/item.php?product-id=43534[/link]