That's why I've dug through what I already had rather than buying loads cos there's no way I'll be near the front, the only ones I'm buying is a set of bowties, the rest is all dug out of my old tyres box!
It is disconcerting though, in 10th there's far less houce but normally your screwed if your on the wrong thing!! On 8th I've more found so far that I use it to tune handling the way I'd muck about with shocks etc in 10th, but it is a bit like being in the dark!!