I have some Cobra Drag pipes that I want to get baffles for, The bike came with one installed and not the other one??? Well would like to get a matching set but can't seen to figure out what ones I need, I have the baffle and it measured 2"1/8 but all I can seem to find is 2" or 2"1/4 ????? this is UMMMM Baffling..... also the one I have is 12 inches in length and I also cant find that length. Please help me figure this out. I'm assuming that when they say for 2 inch pipes they refer to the inside diameter, Am I right.