This is the completed bracket. Aluminium. The cylinders are threaded spacers to get the right position behind the head restraints. Note that this is for Trads with BL head restraint columns, as used on most BL cars including MG and Triumph.

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The perspex panel can be obtained laser cut and drilled on-line. This was an early version. A later version is a bit bigger, and I dispensed with the neoprene edge. It looks better without it.

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This is the upgraded version. I also made a quarter tonneau cover whichattaches to the rear body frame and attaches to the lower edge of the windstop, so it seals off behind the seats, so no draught between the seats.
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There are at least three head restraint shapes on trads, so its never been worth producing these commercially..