Iv got this Giant ATX DH1 Xlite frame i got second hand.

Its got a wierd mount on the inside of the frames chainstay that wont hold my IS avid disc brake.

Its like an IS but its to close to the corner of the frame for my avid IS 7 ball caliper to fit

I wanna know what mount it is and what disc caliper and rotor i can buy to fit the rear mount of the frame.

Can anyone bear any light


Il try get a picture on soon of the frames bracket.