[Amps] Bruene Coupler Needed

[W7RY]

I'm looking for a Bruene type RF wattmeter coupler. A coupler form a Drake W4, or a Heathkit tuner I think are Bruene type.  Just the circuit board and components is all I'm looking for. It's for the internal wattmeter for my 8877 HF amplifier project so just need the coupler. No box or connectors. I bet even an MFJ type wattmeter would work?

What do you have?

Thanks!
73
Jim W7RY