new rear wing

[moggiethouable]

Afternoon All.
I have just fitted a new passenger side rear wing, its painted and after a deal of fiddling it fits surprisingly well for a pattern job.
There is only one bolt missing, the bolt that goes in to the sill, is this normally a threaded socket?
Is the bolt here the same size as the rest, it seems the welded nut? or threaded bush? that would be there to accept a bolt is awol.
What would normally be there please?
Thanks, Dick.

[aupickup]

yes a threaded socket and not a captive nut

[moggiethouable]

Thanks for that.