It still amazes me that with the amount of W-Bodies that were produced over the years that no one has manufactured a bolt on coilover kit. There were only 151,000 total 3000GT's and Stealth's made (for US sales), of which 18% or about 27,000 were AWD and there are bolt on coilovers produced by numerous manufacturers, such as Tein, Megan, K-Sport, and so on for both FWD and AWD. (AWD had a different rear suspension from the FWD)
The "class" of the cars probably play a factor, but still based on pure numbers you would think a manufacturer would be able to sell 10,000 kits easily if available.