Exhaust bolts broke

So last night a local member and I decided to swap exhausts. ive unbolted my exhaust about 6 times at the flange no problem. Not sure about his coming off. But we both somehow managed to break a bolt at the flange.

Does anyone know of anywhere other than the dealership to get a similar bolt. Springs are fine and I'd rather put a SS NUT and BOLT on there. But I noticed the bolt has a spacer type deal made into it right before the threads.

 

Have you tried NAPA or RockAuto?

Did you soak with penetrating oil for a couple days before the removal?

 

Nope. I just had it mine off about 2 months ago and it came off easy then. I wasn't expecting an issue

 

http://m.napaonline.com/parts/PartsDetail.aspx?k=EXT36454_0399517448

Napa has these in stock I cross referenced his truck and mine and they both seem to work. But unsure about that collar.

 

Anyone ever use these type of aftermarket bolts? Or am I better off just buying some as hardware and bolting the two pieces back together