I agree with Diplomat360 and the others with similar responses. I absolutely LOVE my A38/E58 Aspen. As mentioned, firmfeel has a ton of suspension parts since it shared suspension with M body.

IMO, once you swap a transverse T-bar car's rubber kframe biscuits to aluminum, it's a great setup. High speed handling is good, no shuddering, and fun car. I have multiple M's and the Aspen.

I used a dash cap after realizing used dashes were outrageously priced, and were probably going to be brittle. Came out real nice. I also used some interior pieces from an M. Package tray is different but would be much easier to make one than on an M. I have seen lots of body and interior pieces on ebay. The Police Aspens and Supercoupes have always been faves of mine.

I say go for it!