Thanks for the tips.
The switch is from a R&S SMR20 RF generator.
I forget to mention, but the thick aluminum mounting bracket is not part of the switch.
The switch one from AliExpress misses the metal tabs, so it will be hard to mount.
I did some searches on the NE15 switch and it looks quite similar, but lacks the mounting tabs as well. However for this one the size
seems to match, so it might be possible to swap the mounting part (assuming I can find one)
Looked to the thread of the Agilent MM as well. This turned out to be an NE18 switch and the datasheet from C&K also show mounting brackets.
It seems I have enough information to find something suitable
