i found a company on e bay that was selling various bearing kits at a good price, i didnt see any specifically for the ct4, but i got a tmaxx bearing set for my funfactor from them which included all the bearings i needed for about $10...

oops forgot about screws - e bay also mate, just check that u get a metric set, again i havent seen any for the ct4s, but have a look to see what will work for u.

hope that helps...