Coilover conv. help (flat6)

[Bug@5speed(US)]

Panel,

I have been looking at aftermarket coilovers for my ride, QA-1 have been at the top of my list, I was curious if you or others know how to overcome the top bolt size issue.

What I am referring to is that in the back the top bolt is a stock 12mm size, while most aftermarket shocks on this side of the pond come with poly bushing, or metal bearings that the inner diameter is 13mm or 1/2 inch. Obviously there is some slack that needs to be taken, but been beating my head over the issue.

For the bottom not a problem, as I a have 944 arms, and can go with a lower bolt replacement by one of the 944 porsche aftermarket companies.. can't remember the name but its like 150 for the stronger lower bolt.

So my question is how do I take of that 1mm of slack safely.. I even looked around for replacement bearning..

Thoughts
Alex