If you are okay with aftermarket springs, H&R lowering springs are your best option. If you look up H&R spring for a Capri you should be able to find them, I put them on mine, and they look amazing, and it looks how the car should look out of the factory, lowers and levels it perfectly, and improves ride quality. It was really random but I was able to find them on a tire rack for close to $100 cheaper, however, you do have to wait a little bit for them to contact the manufacturer. Here are the springs on summit racing, they should work great if you go with them.
https://www.summitracing.com/parts/HNR-29657/applications