Headset adaptor fork to bike frame

[DanVal]

I have a BBR Frame with a headset diameter of 1 3/4" I'm wanting to connect a Monarch disc ready threaded 1" steering tube. any ideas where I can find a headset adaptor or other idea? This is my first post so my apologies if I did it wrong DanVal

 

[Dan]

Howdy Dan. I got one from a bike shop. They had never heard of one but I had an ebay link and showed 'em. Think it was 12 bucks?

But they exist