Yeah, i've only seen the combo bolts a few times in the wild.
I only remember having a different sized allen key once.
It was with a set of defiant {i think that's what it was named} bolts that I won in a comp. They made trucks i think? Chad bartie, trent fahey, i'm sure others skated for them, but that's all I remember - had a southern cross logo?
I feel like you're the only person who could answer this question Mr Brimson.