Guilty here too.
I did love the METRO JTM45/100 tranny set.
WOW
It's only a matter of time untill I try everything, including your RS tranny clones.
That 159Q is rated up to 500v, so it would be cool for everything except the JTM45/100, and that it's a wider mount.
Knowing Hammond though, it would probably handle 1000 volts for 5 seconds. So 550 is probably no problem. But still I don't take chances like that.