Crossover suggestion for Infinity Servostatik

I suspect that the high channels of my Servostatik crossover are going out.  Mid and bass seem fine.

I'm looking for a 3 way stereo crossover that I can use to bypass the high and mid channels for diagnosis.  Does anyone have a good recommendation?

It doesn't have to be fancy, just something for diagnosis and temporary use until I can get it fixed.  Even a car audio version would be ok.  I can look up the frequencies required if it will help.

Thanks, Mark