FWIW, Medic-0 shows the easy retro fit mount, The mount on my bike, also aluminum, is riv nuts
in the tubes , on the forward side of the seat stays ..

riv nuts as previously discussed here , have been installed and replaced by users and shops
on used bikes .

then the lock itself tends to be bigger than the width of the dropouts
so even if the bands are cut by jyl's gang,
removing the wheel is difficult with the ring lock wrapped around it.