Craig the stock AD truck tank is...well, I've seen several that were baffled about an inch or two from the bottom. That is to make sure your gauge registers empty when there is still enough gas in the tank to get you somewhere (hopefully). And I've seen a few that had no baffle at all. I would suggest removing the sending unit and measuring down in the tank to the bottom. It ought to be 10 3/4". That translates into right at 274mm and so it seems to me the 260mm unit he makes is probably the best option for the stock AD trucks. Chuck's tank is under the seat and is 7 inches deep (which is different). I have one on the way (260mm) and will let folks here know.
