Can't Find Last Part to EW Theremin

Hello!

I'm currently looking to build a theremin. Due to other threads I've seen in this forum, I decided to build the Etherwave Theremin as detailed on the "Understanding, Customizing, and Hot-Rodding Your Etherwave Theremin" PDF I saw floating around.
Unfortunately, as I'm sure most of you know, it's quite old, and as of such, many of the recommended parts are not around anymore. That being said, I have been able to find parts with the same electrical component specifications, as detailed in the schematic, for all but one part:

I've gone around for a couple months looking for the part and even emailing manufacturers to check their stock, and have not yet found any within a reasonable budget (that's not to say they're not out there). Does anyone know where I might find this part or know of an idea for what I could do instead?

Thanks for any help!

Hey Shark,

If I was to start over today I might try these parts for the theremin oscillators.

The oscillators need distance between them so they do not interact with each other.

330pf Capacitor parallel with a variable 

Variable Capacitor  Use 50pf & 5pf in parallel for fine tuning

Coil 1-MH  You want a very low DC Resistance

Christophe S Becker
Old Temecula

The Theremin Phenomenon really is this basic.  Authentic Sound

There is special knowledge beyond parts seen to be more alive than just a deep fluty whistle.
.