mb sprinter, hi top, lwb, need cheapest parts, who can help?

hi need 2 windows , one in sidedoor, the other on other side, directly behind front cabine, need complete roofinside cover, truma gas heater, or dieselheater, i frontseat, all used for a good price. can somebody help me to find this items, and someone who fixed that for me, sorry my english, i am german.thanx hichame-michael