Source for affordable (cheap) plastic or isolated BNCs?

[cdev]

It seems that I may need to use isolated, non grounded BNC connectors in a conversion I am doing of a video distribution amp for timing. I think this means I have to float some of the BNCs using isolation transformers. A few days ago, somewhere, it may have been here, I saw somebody had purchased a bag of black plastic shelled BNCs with internal metal connections. I think that is what I need. Anyway, suggestions are welcome.


EDIT: I have found some isolated BNCs and they will probably be adequate to the task. I'm going to wait until the unit arrives to purchase them in case this unit (An Extron distribution amp) has the awfully inconvenient D shaped holes.

[tautech]

xrunner thought he had a similar problem to replace an insulated BNC in his Tek FG502 but they are available it seems:

I have a bin full of brand new BNC jacks and was going to replace the originals since the center pin female are tarnished quite a bit. Problem is I don't have & can't locate the one specialized BNC, the one that has an insulated ground (see pics). I can find ones on Ebay but they are not made the same and go into a "normal" size hole (this hole is much bigger). I suppose I could use washers but does anyone know where to find the original part?

[I forgot to press "Post" on this from yesterday.  Maybe it's still useful...]

This is in the parts list, KC79-67.  A search on "bnc kc79-67" shows that it's commonly available, amazingly enough.