Mike,
going from the pics your rears look exactly like my fronts except for the size, (330x32).
I looked up DBA catalogue for DBA5000 rotors and found 328x28 version 5046.1SL or SR.
if the PCD of the rotor 12 bolt mounting is 182mm, then i expect they are DBA.
Would love to have a crack at some custom hats to suit, I already have stock VE rear rotors that came off the rear end assembly I bought to rip all the bits off.
This would be well outside my ability or equipment to machine up.
I'll measure the original discs, and then send you a PM.
Might be time for another video instruction series from you.
Dave