Contact Chip at his website, I'm sure he'll know. Previously he was part of Wood World, in Chicago itself before they closed down. He's now out in the Suburbs, but ships Festool everywhere. I actually have that hose as my Anti-Static Hose for my Dust Deputy Cyclone set-up on a Auto Clean 33 Vac, but I don't remember the part number on it. I bought it from Chip years ago. I think it's like 5 feet or 1.5meter long. It's not very long, I can state that
Tool Nirvana is his site/business, formerly Festool Nirvana
I texted Chip for you, maybe someone else can reply if he doesn't.
He replied, said he would look up the number when he got spare moment.