The ignition is labeled ROTO.
I am pretty certain it is from a vendor tho--
All of the various Czech engines seem to have the same, completely shielded plug design tho there are obviously different mfgrs doing them.
RCS sells both the ROTO and the ZDZ and they are not from the same mfgr.
I am swapping the ignitions -- to see what I actually turn in the air with the ZDZ engines .
As for availability w/o the engine -- I simply don't know -Probably not - but the feature is to me - quite attractive.
I have been running the little 25 over and over on the test stand and doing the tach readings afterward is very handy.
I can't believe no one else has adopted this feature.