If you use primitive spacers with longer bolts and you screw them to hard (too much torque) then the bolts will break sooner or later.
If you screw them onto the hub with the correct torque nothing should happen.
Whenever possible use spacers which are screwed onto the hub and the wheel is screwed onto the spacer. Of course this works only with spacer of 2cm thickness or more.

If I remember correctly that Diablo had only 1cm spacers with longer bolts or they even used the original bolts.
I don't know and I was beside the car, that's why I say don't talk about rumours, this nonsense goes from forum to forum and 3 forums later they say there were 5cm spacers with longer bolts installed

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RaymondQV
Countach QV Ex-Mimran #GLA12997, Urraco P300 #20530, Jalpa #FLA12203 sold in May 2006
www.countach.ch
www.jalpa.ch

When Frank Sinatra got his Miura S in 1970, he said: “If you wanna be someone, buy Ferrari - If you are someone, you own a Lamborghini”.