The longer bolt goes in front right
The frame is fairly new (2007 Trek 2100, one of the last US made Aluminum trek's I believe). The rear seatstays including the wishbone area are CF, so it's pretty thick (about 35mm total thickness). As far as I can tell, I can't get the flared allen-key end of the nut to fit into the hole, so my only other option would be to get a longer brake nut?
Looking at my other bike with Aluminum stays, the distance is much shorter, so i'm assuming it's the thick wishbone area of the carbon stays that's causing the problem. Does this sound right? The frame is anything exotic, which is why i'm wondering if this is a common issue.