RR Mk 19 and the BBMF Mk 19 have them retrofitted to single props. But that entails installing the front gearing off I think the firefly, not a simple task.

The ones all cowled up will be power eggs, as opposed to power plants, which means they will be complete minus the prop and are designed to bolt onto the aircraft complete forward of the connection point, they last had corrosion checks in the 80’s according to some of the paperwork with some of them, the bagged ones are better as I think they were 15 years without inspection but it’s a long time since I dealt with mpv bags. Hence price differences,   So to answer your question I do not know, try speaking to the Coventry guys as they brought their shack back to life.