Kit for Burroughs B-5092 tubes?

1. Since you are looking to make things fit in an existing case I suppose you want the flexibility of a controller board that you can wire up to the tubes - as opposed to one that has the tube sockets on the board. Something like this will work:
www.nixieclock.biz/StoreClassicRev6.html

Disclaimer 1: The linked kit is made and sold by the owner of this forum.
Disclaimer 2: I am not paid to recommend his products nor am I his employee.

2. ZM1020 / ZM1022 are direct replacements for B-5092, If you look here:
www.tube-tester.com/sites/nixie/data/B13...mull/zm1022-mull.htm
toward the bottom of the page, you will find dimensions and a huge list of other substitute tubes. Conspicuously absent from the substitution list are any Russian tubes. AFAIK there are no Russian tubes with the same dimensions. That's a bit unfortunate since Russian tubes are (were?) the easiest to get. "Were?" because most "Russian" nixie tubes these days come from sellers in Ukraine - obviously a problem given the war that's going on over there!

This may be of interest too - best collection of Nixie data sheets that I've found:
www.tube-tester.com/sites/nixie/nixie-tubes.htm

No problem - happy to help.

USA tubes are generally harder to find than Russian or Western European tubes. Burroughs and National are the only US manufacturers that I can think of. European tubes by Mullard, Valvo, Siemens, etc, are somewhat findable. Japanese tubes exist, somewhere, but are pretty much Unobtainium. EBay is the most active Nixie tube marketplace that I know of.

Wait... 8 tubes?? What do the extra 2 tubes do? I only know of 6-tube and 4-tube kits, anything that runs 8 tubes (tenths and hundredths? Or what?) would be custom from scratch. I, or any number of other guys on this forum, could design and program such a thing but that's gonna get expensive!

The Classic Rev 6 kit is a complete clock controller. You need to add tubes & sockets, an external power supply (decent quality wall-wart will do), wiring from controller board to sockets, and of course a case. The optional WiFi module is highly recommended. Once set up on WiFi you will never have to set the clock since it sync's up with NTP. Or if you're putting it in a car or something where network access is not constantly available then the RTC (precision timebase, battery backed) option is best.

The Classic kit multiplexes the display so your wiring would consists of 16 wires on a typical 6 tube clock. 1 wire per tube (anodes) plus 10 wires to the first tube (cathodes aka the digits). Then jumpers from tube to tube to tube to common all the digits together. Better to look at the construction manual for clarification of wiring rather than me trying to make sense of it in text.

Look here: www.nixieclock.biz/Downloads/ClassicNixi...nstructionManual.pdf starting on Page 27.
Here is all available literature for all the nixieclock.biz products:
www.nixieclock.biz/Manuals.html
Note that schematics and source code are freely available for almost all of his products, in case you want to customize.

Also - do you actually know the condition of the tubes you already have? There's a pretty good chance they will still work unless they've been physically damaged. Nixies typically have very long lives, 10,000 - 100,000+ hours depending upon model. I personally have tubes that have been operating 24/7 for ~15 years, that's ~130K hours, with no signs of giving up.