I like the "Quanta" Made in Canada tank I got for my 68, as I did not care for the painted OER version I saw at swap meets.
Most opt for a replacment tank vice restoring the OLD tank, my thinking was after all the years of abuse, dents, undercoating, corrosion, paint overspray, etc the efforts to restore, (obtaining real plating vice spray painting the exterior) and cleaning & sealing the interior of the tank was not worth the efforts when compared to the current quality avail and offered by the Quanta tank.
The appearance of the 67-68 tank is great.
I have heard that with the 69 tanks (Brand unknown) can have filler neck, position-angle issues?
Jim