Originally Posted by lucid
I was planning on doing the same thing this week. Do you mind sharing the dimensions if you have them written down somewhere as that would save me some time? Thanks.
1" square aluminum tubing (home depot / lowes)
cut 1 piece 18" long
cut 1 piece 12 1/2" long
I clamped it together and drilled holes for the bolts (about 1" in from each end of the shorter piece). I think they're 2-1/2" long 1/4x20 bolts with washers and lock washers, and wing nuts.
I bolted it together, and then clamped the two pieces together, and used a dowel centering jig to drill the hole for the head rest posts in the center of the two pieces of tubing. The head rest posts are 5-1/2" on center, or 14mm.
For the camera mount, i bought an inexpensive one from local camera shop, i think it used a 3/8" by something about 1-1/2" long
For my e46, the head rest posts were small enough in diameter to allow me to slip some plastic tubing over them... the e90's posts are larger in diameter, so I'm going to have to open up the holes and get some larger ID tubing.