DIY Exhaust Pieces?

[72step]

My next step on my 65 C10 Project is to set up the exhaust as simple and close to original as I can. Does anyone know of any vendors that sell individual pieces to weld or clamp together? I know my local oreilly has some pieces but I didn't see the flared piece for the manifold nor the piece that goes over the rear. I know someone's gotta sell this stuff because I've seen where muffler shops usually have a stock of this stuff. I can get an exhuast put in for like $300 but I'm on a budget for this truck here. According to the prices I saw at oreilly I can probably set it up my self for under $100 if I could only find the darn flared manifold piece where the donut goes. THanks for any info.