D772SB Shimano to XD change

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Joined: 02/09/2020 - 01:42
D772SB Shimano to XD change

I have this D772DB for a long time, last week i bought a sram xd cassete body for it, to change from shimano to sram.
The freehub it's a B2 with 4 paws, it came with a spacer that looks right.

So I removed the shimano body, and replaced with the sram, but the freehub it's kind of stuck and doesn't spin...
The freehub fits perfectly, but if I tight the end cap it kind smashes the feehub against the hub...
So what's wrong here? The spacer that came with hub it's a little short? Or I'm missing something?
What's the correct spacer size for this combination?