Oh! WOW. That's huge. I just confirmed it's in the Tesla EPC for the new S as well:1619321 This one is for S/X (Plaid/LR likely) as far I know
1619321-00-A MX 2021
1619321-10-A MS 2021
I'm ... actually gonna go try that Crazy as though it may seem, there's a kernel of hope to this madness (it's not known to be incompatible with the older year 3, put it that way).
Off to go sell my 1537264 Gen4 and go bug Tesla for a 1619321...