NR-AD-K's fuel volume is way too high. You can't cram a Jumbo worth of fuel in there, more like Rockomax X200-16 at most.

same goes for NR-AD-S3B, but it is a bit easier to calculate.
Jumbo has rough cyllindrical volume pi⋅1.25^2⋅7.5=36.8m^3
NR-AD-S3B by mean radius of 2,1875 would roughly be pi⋅2,1875^2⋅1=15m^3, or 0.4 Jumbo.