er, So OP, what kind of "Haro 29er" you got,, this one looks like the monkeybone.. a creation of Cycle Monkey
https://www.cyclemonkey.com/rohloff Rohloff Monkeybone on Chainstay IS Mounts- Mtbr.com
https://haromtb.com/collections/xc-s...Cat=flightline
with the type 2 OEM fitting rather than the torque arm will do .. Rohloff compatible discs are unique,
Avid makes about the lowest cost 4 bolt Rohloff disc..
https://fernandoj.wordpress.com/2013...e-plate-types/