Proportioning Valve Kit: 4x4 Disc w/brackets, brass - SIDE MOUNT KITThis BRASS original style kit is probably suited more those changing to 4 wheel disc but used in most any 60's & 70's GM brake conversion to 4 wheel disc. The proportioning valve body is set up for 4 wheel disc, lines out are for use with 9 16" & 1 2" Ports, are stainless steel while the body and PV are chrome plated. ALSO BUY A PVTOOL if you don't have one.. listed under "PVTOOL" Kit as shown We purposely have the # "PVTOOL" cheap so you'll have one