How many NON-LM LM-engined F1's are known to be extant?

[murraydeschot]

I'm sure a trawl through the plethora of info here could possibly drum up the right answer, but as a short-cut, just a simple question. Plus, aside from retro-fitting the LM engine, what other conversions (i.e. HDF kit, etc.) have been tackled on these cars?

[hurstg01]

As far as i know, 2 -
chassis #018

and chassis #073

both have what is rumoured to be an LM-Spec engine. Both cars have had the HDF kit added.
#073 has had Sat Nav / Radar detector / stereo upgrade added by the looks of it, as well as having an LM style handbrake lever

#073 has its chassis # in the dials on the dashboard

as well as GT style seats (?)

and a silver F1 logo on its rear wing endplates

as well as Gordon Murrays signature near the chassis plate

#018 has had an aftermarket stereo added too

along with GT style seats (?)