Modelkasten also makes these w/ the hubs that let you take off the outer road wheels, but I think the Tamiya kit also has this feature. MK may be more accurate.
http://www.modelpoint.us/s.nl/c.312672/sc.2/category.5/it.A/id.141/.f
BTW, you should check out out Tiger I group build on this forum. It starts 12-4-04. We'd love to have you.
Thanks,
Ted