I have this great looking HKS welded Aluminium pipe that I got with my new engine. I would love to use it, but unfortunately it is the wrong diameter for the MAF sensor to work properly.

So I want to build something similar, with a slightly smaller diameter.
I cant weld, so I would need someone else to do this for me.
However, I am not completely useless.

I want to draw up some plans that I can give to the fabricator, outlining exactly what I want.
But I want to know... What size bends, lengths etc. of pipe are available in stock?
If you know what I mean.
Eg. I need a 65mm (or so) inside diameter for the pipe. I will need 1 or 2 90 degree bends or 45 degree bends, and a few sections of straight pipe.
As well a as a flange plate on the end, to attach the pod filter.
Basically I want to know what size bends etc. are available, so I can accurately draw my plans. And perhaps buy the bends, once I have decided on how to proceed.
I want to draw some shop drawings, from which someone could fabricate this intake.
Does anyone here who works as a fabricator or similar have any idea how I could get some info? Or where I could source pipe bends etc?
Thanks.
Roman