Just a word of warning about Wagaero tanks:
If they don't drop in flat and flush to the seating flange, don't force them down with the straps.
I bought Wagaero tanks to install in my new set of Univair wings and they didn't sit flat or flush, even though my uncovered wings were new, certified original wings that were installed and correctly rigged on the airframe with proper tank felt strips. When I dropped them in they rocked like a teeter-tauter--over an inch one away and over 1 1/2" the other way. When I tightened down the straps I found that the tank bottom had significantly bowed the compression struts and the front of the tanks rubbed on that one backward-facing wing attachment fitting bolt. Also under the front and rear tank lip the tanks rubbed on the wing fittings--and they rubbed hard enough to gouge the tanks; not just scratch them.
I would not have noticed the severity of the problem if my wings were covered at the time.
If yours do drop in flat and flush to the top of seating flange, complete the installation as normal and then remove them to inspect for any scratches/dents in the areas I mentioned before final installation.
I returned them to Wagaero as defective and, after they tried to claim my wings were to blame, they finally admitted the tanks "could" have warped during manufacture. The replacement tanks were better, but I still had to use a ballpeen hammer to shape the tank to prevent the tank rubbing on the backward bolts and wing fittings.
Other than that the tanks were properly fitted with front and rear fuel bungs, crossover bungs, and sight gauge bungs--none of which leak under pressure testing.
I hope all you all are safe and well.
Paul