Which gas tank to buy

I bought my Spectra from Rock Auto, still waiting for the F*&%$#ng grommet by the way. Tracking says it arrived in Canada on June 26, I can only guess where it has been since then, considering 521 Restorations is in Colorado and I'm in Alberta.
I bought the tank for the Duster from Rockauto and it seems real nice. Fit really well but, i dont remember the brand. I do remember it was only like $85.00 plus shipping.