kelsey hayes part and proportioning valve

Yes!

Or and aftermarket adjustable one that is plumbed after your original block on the rear line.
Thank you!! I do believe the one i ordered is correct for the disk and drum setup, and just realized Dave is the one i ordered it from..Ha! BUT, wouldnt it be simpler for me to just splice in the simple hold off valve like you have being its just 1 line in and 1 line out? If so, i think i would rather do that than trying to rig the combo valve in there..