Im sorry but I dont have the measurements and Im not removing my heat shield to get em either. SO NAH!
Anyway it was a dual muffler tip with flared tips. We hacked off the tips with a grinder and Torque welded them to the mufflers. Im sorry that i dont have any measurement info for ya.
Do what I do. Take the muffler with ya and see if it fits in the store. Always worked for me
now if I only could figure out how to make a "safe" flamethrower... Any takers? Do i just need a coil, switch, and plug?