RRC Ambulance

Hi folks, just bought an Ambi to convert into a day camper for the family. Car runs great but few wee niggles,first one, is the font quarterlights. Need rubbers, assume it was a 2 door before conversion. Can't find any. Anyone got any ideas. Also need new door tops are mine are shot and finally,the window seal that seals between the door and the glass on the outside and inside are shot.

Next topic, suspension. It would seem that my Ambi has double springs on the rear. She is very very sloppy an rolls terribly.

Was thinking a big bore shock and had spring upgrade but wouldn't have the dual spring on the rear.

Any advice?