I have the vintage wheels and adapter on GTD standard for more than 10 years and it works perfectly.
I had 17 inches wheels but changed back to the original i.e.: 15'.
Àvon tires 245 front and 295 rear.
I had 2 times a serious exit at Spa and the last time I killed 2 wheels agains the wall in the Raidillon.
The bolt on adapters on the GTD part are still intact !
I know Frank has his view on safety about the bolton and I respect his view as well.
I've been hit on the Le Castellet track last year. It destroyed a wheel and a tire (and ruined my paint job). I was happy to have 3 pieces wheels, as, after a careful checking, only the outer rim appeared to be damaged and had to be changed, which was not so expensive... (not to mention the price of a new avon tire and of a complete paint job !)