Rippled exhaust tubing fexitype Triumph size

Hey guy I have see in a few posts about Triumphs that some of you are welding in the harder fexi tubinh to get the rippled look on the exhaust, Where do I find that siz3e? I checked out the local pepboys and the only have 2 inch-2.5 in I am for something along the line of 1.5 to 1.75 inch for a custom grill I'm making. anyone have any leads?

 

Here is what I'm talking about

 

BTT somebody has to know wee to get this stuff?

 

Here's some very weak help-The company that makes that stuff is - Precision "something or other" Inc.-
I can't remember the entire name. I called them once and got a product catalog (7-9 yaers ago). I wanted to make rippled Lakes Pipes (another project I never got around to)
they may have the size you want. It's a better bet going to the mfgr. than a retailer. So I guess you gotta do some Googlin' around.