Regarding spring (mounts) seats I have only ONE advice. Go for OEM.
Believe it or not, aftermarket parts WON'T last. Mine lasted apr. one year (about 25.000 km).
This is the one:
https://www.ebay.co.uk/itm/192526112066?ul_noapp=true
Just watch oragex's video about them:
https://www.youtube.com/watch?v=kpGd-_s46bw&t=12s