Nuts for CD changer?

[Gofast]

I'm trying to install a stock CD changer I bought off ebay, and I was wondering if anyone happened to know the size and thread of the bolts welded to the CD changer mount in the trunk of the car. I think I'm just gonna end up going to the hardware store and use trial and error, but that's a pain in the a$$, since the part is welded to the car, so I'll have to walk in and out like 50 times.

This is a 92 325is with the prewires (non-IBus)

[Gofast]

I just got back from the hardware store.
In case anyone wants to know, the nuts and bolt that hold the CD changer into its mounts in the trunk are all 6mm.

[Quake]

Thanks for the info. How about the screw or hex nut that you attaches on the rear deck? On my cd changer bracket i have 2 bolts and i either one screw or bolt to attach to the rear deck of the car.