72 Duster with a Rusty fuel system....how do I avoid this???

Shoot, man! I thought new tanks were more expensive. I just did a google search and saw this....

http://www.carparts.com/details/Dod...igImmxWMhElYqiim1XLTsaAsEo8P8HAQ&gclsrc=aw.ds

Sixty bucks for a new tank???
The 1970 and later cars with the EVAP system holds 16 gallons, the early ones without it hold 18. I checked the numbers for a 69 Dart since I know they also use the same fore/aft 2 strap retention.
The only question then is....Is the filler neck grommet the same size? It would suck to buy this and find the stock filler neck won't fit!