for the first gens go to overboosted.com and contact mike, i´m not sure about the price, i think around $60,(the only problem with these is that they hit the underneath of the hood a little,but i´ve been told it doesn´t cause any problems, i ordered one but i didn´t get it yet so i´ll let everybody know about the hood thing when i get it)
also check out the first gen section of the ERDT message board, theres a post about strut tower bars.