Looking for original Bendix 0411, 007 brake proportioning valve and y-pipe between catalytic converter and mufflers. Threads stripped on original proportioning valve when I was tightening brake line. I have not been able to locate y-pipe. Purchased new mufflers and tailpipes from Walker. They do not repro y-pipe. Want to maintain original looks. Any recommendations? If not available I will prefab y-pipe and use modern proportioning valve.