I tried to put the Dunlop flushmounts on both VPs 7 went smoothly on the white VP:
View attachment 7039494
And I really think it improved how the bass hangs, when I look a the neck, I'm seeing the side of the fretboard squarely, not on an angle as per usual. IMO, more comfortable to play. On the black VP however, not so good.
View attachment 7039500
You probably can't tell from the photos, but the black VP flushmount is closer to the headstock by 1/16 to 3/32". I used the original straplock holes as a guide. When I drilled the black VP hole deeper I hit something hard, maybe the trussrod? I thought the pilot hole went in to the depth guide, but I think the chuck was a little loose and the bit actually went further into the drill. I discovered the error after I drilled the 3/8" hole and tried to screw it in and came up short. I errantly assumed both original straplocks were installed in the same location. So now I have to plug the hole with a dowel and re-drill. It'll still be worth the effort for the increased (to me) comfort.