1967 GS400 brake metering valve

I'm looking for one of these brake proportioning valves from a 67. Its a factory 4 piston disc brake car and this valve is locked up. I've seen similar valves online but they seem to be from 68 or later and from other GM cars. Does anyone know where to find one or something that will work in its place. This valve goes from the master to the rear line and somehow controls the fluid to the front brakes. Thanks Jon

 

I have this that is correct in appearance for 68-69.

 

This is something I have saved.
312 -67
314 68-9
316 70

I have only seen one like Jon's ever. On a 67 GS400 disc car, early build also. Maybe Buick only part or replaced by the above midyear. Maybe Gary will chime in. Only a couple hundred GS cars came with disc IIRC.

 

Thank you for the post It looks like that style may be the best option

 

Thanks for the photo of different style valves. I looked up supercars un..it appears they will only sell you a valve if you have one as a core.

 

Let me know.