I had a camera mount that was made from galv square tubing, had holes drilled in it so the head rests slotted thru to hold the mount in place. Didnt have bucket seats in my car as it was an RX. Only catch was to keep the camera level, both seats had to be adjusted in the same position. Got the plans out of an early autosalon magazine.

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Evolution 8 MR

Forester GT