The hubs are sold in 2 different versions now
1- with the back space plates and outer flanges for the same old price of 69.00
2- without the back space plates and the outer flange for 49.99
It sounds like to me you bought the 2nd listed version ..
If you want the back space plates and the outer flange kit it is available separately for 20.00 per set . ( 2 wheels )
Right now I sell both versions direct, and Todd at BRP does as well.
DDM will do the same once they run through their remaining on hand inventory.
I'm not sure what your issue is with the installation of the lock nuts without the outer flange plate, this has been done that way for over 20 years on 1/4 scale cars and it has Never been a problem , both in mounting or reliability , we race 100 plus lap races with out the outer flanges and just the nuts run down on the plastic Wheel....
We also run them with the bolts going through wheel from the outside and No nuts, and the head of the Button head 1/4x28 thread bolt is larger in diameter than the nyloc...