Quote:
Originally Posted by lelandr
I've used the VAC seat mounts in my E30 M3 for more than a decade. I've found that they are excellent. I have also sourced them for my Z4, and the pieces are again excellent quality.
My Z4 came with the Planted mounts, and they leave some things to be desired. While they seem decently constructed, the mounting tabs to the floor are pretty thin, and the mounts could be lower. Additionally, the inner floor mounting tabs (near trans tunnel) are under the main structure making them essentially impossible to properly tighten the fasteners (factory fasteners are 28ft-lb + 90deg).
I would choose the VAC mounts every day of the week.
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I did a fairly lengthy write up on seat mounting. Most mounts on the market aren't great. Belt only correctly located in one seat position, crappy sliders, etc. VACs are, IMO, particularly bad-- a friend of mine had them fail in a crash (as in, the slots the bolts go through to attach the seat to the car failed). I would rather stick with the stock seats than use VAC mounts and/or slides.
Things I value in aftermarket seat mounts detailed here:
https://nam3forum.com/forums/forum/m...ck-bucket-seat
Semi related: I am a seat engineer (albeit for commercial and military vehicles, primarily).