They are available from all over 
. Turns out I saw them last night while ordering more of the ±12v modules that I made the part for yesterday and ordered some. Won’t be here for a month or so but I’ll have a part when they arrive this time .This is a relatively minor (if you are familiar with parts creation) modification of the ±12 module. I put it in parts submit (where eventually it may make it in to the core parts bin) in this url and you can down load it from there. If it doesn’t match the real device, please post and I’ll fix it .
Peter