I just installed the same kit on my CX500(I have same caliper as you on it) and brakes are working great.Thank you for your reaction.
Finally I have found following set which should fit my front brake; https://www.ebay.com/itm/1982-1985-...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
Moreover I have bought new EBC PA90 brake pads and HEL steel braided brake hose. When everything arrive I will rebuild my brake. Currently bike waits in garage for "new brake".
Meanwhile I will work on carburetors.