Dart Fuel Tank
Do a search for a Spectra brand tank, they are supposed to be better quality.
DO NOT USE A NEW LOCK RING FOR THE SENDING UNIT, THEY LEAK, REUSE THE OLD ONE OR GET ONE OF THE OEM ONES FROM HALIFAXHOPS... The new ones do not have the proper "depth" to make the seal work properly...
http://www.forabodiesonly.com/mopar/showthread.php?t=324843&highlight=lock+rings
Also there have been alot of comments about the new sending units not being accurate, try to keep the old one working. I would suggest to at least replace the filter "sock" on the end of the pick-up tube...