Well... I finally pulled the trigger and purchased a four into four reproduction of the original exhaust for my 350f restoration this morning.
Since my bike's original exhaust has been long gone for some time, I went ahead and purchased the whole nine yards including new brackets, hardware, exhaust gaskets, and new exhaust collars for the header pipes.
I purchased everything from CMSNL and after the USD conversion, it was a painful cost to look at... but I think it'll be worth it. This would have cost me a few hundred dollars more purchasing from David Silver Spares. To the best of my knowledge, the exhaust systems are exactly the same from both suppliers.
The goal is to have this bike ready for the All Clubs Day Vintage Motorcycle meet in Stockbridge, MI on September 17th. Has anyone else purchased reproduction original exhausts for their cb350f? everyone I talked to speaks very highly of this exhaust.