That is strange the basket didn't fit on your 21' S. The STM parts should fit up to 2023? I'm unsure of what the design change is on the clutch basket/bowl for that update though.
I didn't have any fitup issues with the red basket going into the bowl, it was straightforward to remove and drop in the new hardware. I can't think of how the basket could've been installed further into the bowl housing to cause contact. It bolts directly to the gear without washers
Where was your dry clutch installed? If there was rubbing, that interference should have been noted during fitup. The basket could be rocked back and forth slightly in the bowl, it shouldn't have a tight fit like you've found. I would make sure you didn't get a 23' basket sent to you by accident? I bought my kit from the same website
View attachment 55170
I triple-checked the parts number when I ordered it; based on whats available on the internet.
ADU-0015 is the set number for the basket+plates; confirmed on the box.
ADU-0010 is etched on my STM basket; the same one as I saw on your photo.
I dont think it's a mix-up with 2023 model as the parts seems to be ADU-0030 per Belissimoto.
That basket and pack seems to be 40T instead of ours' 48T.
The basket replacement was done at a reputable local shop; not a Ducati dealer.
I didnt see it being installed, but I saw it when it was subsequently dismantled.
I wont describe the fixing as "snug" as the side gaps are there; and the basket drops into the bowl easily.
No washer, just bolted straight on.
The basket diameter seems the same, but the bottom convex profile seems different.
As the result, the height of the STM red basket is "taller" but there is no visibly-obvious jutting out from the rim of the bowl.
That's why it wasnt immediately noticed. We only confirmed this later with vernier calliper. The two baskets are phycially different dimension, height-wise.
Even with this issue, the bike can still be started, ridden, and pushed. I rode it for around 50km.
I did notice slight jerking at very low rpm, but in my mind it attributed it to the new plates bedding in..
I am not sure if the two baskets are really incompatible or if this is a sign of improper installation when I first converted to dry clutch..
Eg, if gear parts (4) isnt perfectly straight; or isnt proud enough.
Coz I have gone through 2 sets of clutch plates within ~10k km. (this bike is my daily city-ride; full of stop-go traffic).
And that when checking with the feeler gauge, the "jam" only happen at a few spots around the base. So we are talking abt milimeters of clearance issue here.
(But thats also after the basket and the bowl have been rubbing for quite a distance..)
I can share the aftermath photo of my STM basket here next time after I collect my parts back.