Adaptors on the Nikon TE2000-U side port

[Ko, Alex]

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Hi ,  we are looking at adding a PMT detector on the side port of the Nikon TE2000-U.
which Nikon adaptor should I use to convert it into a C-mount, any suggestion is appreciated.
A T-BPA photo adaptor first and then followed by a C-mount adaptor ?

Thanks in advance.
Alex