This 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 for future use and maybe a mechanic if your using one will need it and probably not be aware of them etc.. but so you will do it right to start with , get one, use it.., these are NOT the same as a common Holden Prop Valve... use of of these whenever bleeding the system... otherwise you'll most likely stuff up a new proportioning valve.