Volvo 940 GL the road trip continues.

Hello friends of the Lego Autos. I have acquired another milestone. A 1992er 945 with 2.3 liters and 131 hp. I grew up with Volvo from child’s legs. My father started cleaning with Amazon, then 140, and with the 240 only turbo ́s up to the V70. I am looking for help and information here. Currently, after through repair of the technology, fresh tuve and approval clean clean first. Does anyone have info where I get reinforced spiral springs for the rear? It hangs a little down to me at the back. A set of shock absorbers that improve the spongy driving behavior would also be very fine. And a sports exhaust. Either ESD or from Kat.