High belt temps- solved?

Hey all,

I’ve been battling high belt temps, mostly in high gear/high load situations. Long story short, I removed the secondary and there’s no splined spacer behind it. I watched the OSP clutch alignment video which shows a 1/16” splined spacer on the shaft before the secondary slides on. Can anyone confirm it’s supposed to be there and what the part number is? I don’t see it on any exploded diagrams...

Thanks!

2018 XP4T