Sorry, but gas tanks hanging down below a vehicle are a pet peave of mine.
Might I suggest that before you install that low hangin blazer tank that you check out the following link for some photos and some additional ideas.... Just want to be sure you know what you will be ending up with before you lay down the hard earned greenbacks for the parts.
http://67-72chevytrucks.com/vboard/showthread.php?t=453832&highlight=gas+tank+thread
