goodolpg
Just an old fart trying to help.
490780 is one part number for the gray coned original woofers. 490781 is one number for the clear coned version.
There are other numbers I believe for the clear coned woofers. There is also a "standard dust cap" 10" woofer that I suppose might work.
Good thread here about the woofers: https://audiokarma.org/forums/index.php?threads/infinity-rs3b-woofer-and-schematic-question.1013839/
And another: https://audiokarma.org/forums/index.php?threads/infinity-rsa-woofers-missing-any-suggestions.851649/
Klaus's Infinity site shows both 902-2279 and 902-2279A (although the "A" version may have a different cone configuration, possibly shallower, I'd use as a last resort but that's just me) as possible replacements as well. http://www.infinity-classics.de/technik/manuals/RSa_technical_sheet.pdf
And another thread: https://audiokarma.org/forums/index.php?threads/902-2279-vs-902-2279a-10-woofers.403697/
There are other numbers I believe for the clear coned woofers. There is also a "standard dust cap" 10" woofer that I suppose might work.
Good thread here about the woofers: https://audiokarma.org/forums/index.php?threads/infinity-rs3b-woofer-and-schematic-question.1013839/
And another: https://audiokarma.org/forums/index.php?threads/infinity-rsa-woofers-missing-any-suggestions.851649/
Klaus's Infinity site shows both 902-2279 and 902-2279A (although the "A" version may have a different cone configuration, possibly shallower, I'd use as a last resort but that's just me) as possible replacements as well. http://www.infinity-classics.de/technik/manuals/RSa_technical_sheet.pdf
And another thread: https://audiokarma.org/forums/index.php?threads/902-2279-vs-902-2279a-10-woofers.403697/