applecolor 13" rgb monitor with db 15 connector

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So I found the above monitor in my basement.
forgot it was even there.
hadn't seen it in about 15yrs.
Still powers up but i have nothing to connect to it.
It's small but thinking it would be cool to use it for emulation of old computer systems.

After some research i think all i need is one of these to hook up a VGA source.

https://www.amazon.com/Adapter-DB15-Male-HD15-Female/dp/B0016OC1J2


or I have an extron rgb scan convertor with BNC outputs and i can also pick up a bnc to db 15 cable?
I'm really not sure because i believe this is a 15khz monitor.

Thanks.