Wanted - B model exhaust brace

[N170BP]

Folks, I need the exhaust brace that connects the two stacks
(upper end) to the carb base. I tried buying a new one from
Premier Aviation but it's for a later application (later style mufflers?).

The part number is:

0550159-5 Brace - Exhaust stack (serial 25764 & on)

In the B model parts book, it's on page 87 (figure 50 - Engine
Assembly, item -13)

Any advice on where to find one of these rascals is appreciated....

Bela P. Havasreti
'54 C-170B N170BP