"56 MK1 chromium plated beading-to-body fasteners

I have a 1956 MK1, serial # S940061 (it matters, some changes started at 941265). The body shop and I are trying to find the "clips" and "studs" used to fasten the "chromium plated beading" to the body. The manual calls out part #'s BD.9848 (approx. 28 ea.), BD.9851 (approx. 60 ea.), and BD.11719 (2 ea.). I have no source citing supersession parts' numbers, if there are any.
Does anybody have a source of parts or information to possibly locate these fittings?
We are close to ready to use the fasteners (see pic) and anxious to get past this stumbling block. Contacts with the usual suppliers of Jag parts have been unfruitful.