Sidescreen fixing plate attachement

[jabawok1]

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I have two threaded metal inserts in the ash of the rear quarter arch. I assume these are for attachment of the sidescreen fixing plate since their pitch is correct for mounting of diagonal screw holes. I have not seen these mentioned anywhere so I assume they were included only on certain builds. Does anyone know when they were added/removed and where I can acquire replacements? John Boocock TC 3621 Cambridge UK