Looking for advice Bruker Filter RF connector type and availability.

[magnetchief]

Hi,
Wanting to replace a couple of connectors on a Bruker RF filter.
These are 50 ohm, something like a Blind mate BNA but I'm sure that's not what they are called.
Looking for 6.
The name, connector type and a US supplier would be much appreciated.
Many thanks

[magnetchief]

Added detail. Diameter across here is 0.33"  (8.3mm)