im doing this upgrade to my vp. it depends what series your vp is too, i think they switch from inverted flare to round style flare on your brake lines after series 2. youll know by the way they look. also if your doing the upgrade its recommend if you go with metal braided flexible lines that you do the whole car. if not doing all the flexible lines just go with a rubber lines for the front. i bought the safebrake braided kit for vp with vt front upgrade. not sure whats its worth now though, around the $300 mark i think (all lines). if you want to do the conversion on the cheap just go to a pickapart or what ever local wreckers you have to get all the stuff, booster/master cylinder and calipers.
heres my vp with the conversion hubs ($200 for the pair, + new wheel bearings $50 for pair, get some high temp bearing grease, a can or 2 of brake cleaning solvent, and new split pins) used a cut off wheel to clearance the brake dust shields too. (also disregard the braided line in this photo, they were for the standard vp calipers, sent me the wrong ones and i had to exchange them)
wheel bearings
inverted flare old line, round flare new line. i converted all the hard lines throughout whole car to round flare because the aftermarket brake line companies dont really cater to the older cars.
vt discs with vt calipers, safebrake vn-vs to vt front braided lines (round flare available only as far as i konw). theyll bolt straight up with only trimming your dust shields as a mod for clearance. i bought seal kits for these calipers too so they have all new rubber on pistons, dust cover, and slide pins. obviously i just test fitted for photos theres no pads installed yet.