hey everyone im new to this website let me introduce my self i live in australia and love fishing hunting and bike riding im 15 and i have an avanti atomic bike 
okay so on ebay i borught a Retro GT LTS STS Rear Disc Brake Adapter Mount MTB Blk adapter and it says for pe-existing mounting hole so will it fit i'll upload some pics

okay so on ebay i borught a Retro GT LTS STS Rear Disc Brake Adapter Mount MTB Blk adapter and it says for pe-existing mounting hole so will it fit i'll upload some pics