The local dealer says gas tanks for '85 735i's are no longer available as OEM. I've had one on order from Bavarian Auto for nearly 6 weeks and no firm answer from them on delivery. The price is $250. I found one from a distributor on the web with the right part number which was listed for a 733 of some year but cost much more. No luck in finding an after-market one. I'm thinking of having it welded. It's still, on the car and my mechanic thinks it's leaking as there's a gas odor when the tank is full but none when half full or less. Any suggestions?