thanks Worf
i had a set from years ago in a box of spares i had, but i lost the key.
a kind fellow 928 owner gave me his genuine key and i striped them down, removed all the tumblers from the locks and fitted all back together.
so now the locking part pushes over the nut and is a nice firm fit, and to remove them just insert the key, turn and they pull off.
i got a set of the plastic covers - before they go NLA- and i think i will list them all on ebay for the concourse brigade
if no takers i will put them on the SE
the 4th one still needs to dry, so not pictured.
cheers
Phil