think the ones you are talking about are magura bolt, they get used quite alot on ktm's aswell, kind of a nasty yellow-green colour? alloy, used in low stress areas.
yep -venhill made them and there were used in the magura`s as well,i have them on my american in places and always call it venhill gold instead of gold so people know the difference
And yes alloy
Sounds like the ones they use in the Areospace industry. High quality aluminium,light and yet relatively strong. Should be readily available from a decent fastener supply shop.
Like these?
Yes got some too, weird weird colour, yellow/gold/green? as hard and tough as Aluminium gets? They have asooth but very matt and hard finish to them.
Let me know if you source any?