The 50 Series Saddles and Stirrups will gauge down to HOn30 and HOn3 track.
 
The constraining factor is the axle spacing. In order for The Saddles to fit under
all the powered axles, the (centre-to-centre) axle spacing must be at least
13.5mm (.531 inches).
 
The accompanying pictures show a successful set up for two HOn3 ... K36 [#484] andK37 [#497] ... locomotives.
 
Although we are very encouraged with the results, actual results may vary due to model type and manufacturer.
 
There is no issue with the 50 Series Stirrups.

Our thanks to Roland Levin of Stockholm, Sweden for his generosity in taking and sharing his pictures.