I have a 2002 Giant AC-1 that I was planning on installing a Blackspire stinger ISCG to but it turns out my bike has some weird and funky mounting tabs. The space between the top tab and the front bottom tab appears to be ~95mm. Any idea what kind these are and what mounts to them? I'm having issues with my bike throwing the chain inside on the granny gear and the LBS said the derailleur could not be any better setup. Seems to happy only in granny gear when I'm im pedaling hard towards the top of a jump or hill. Chain stretch is fine, replaced rear cassette. I thought the chain guide would help but it doesn't fit lol.

Giant ran their own guide tabs for awhile.