Rear shock mount same between 1/2 and 3/4?

[Jakes-66-K10]

I just pulled this from my 3/4 ton because of a broken bolt. I have found some in a junkyard from a 1/2 ton but the shock mount pin looks smaller on the 1/2 ton.

But the more I think about it, I'm wondering if my existing mount has some kind of spacer over it to make it a larger diameter... I've never replaced these, do new rear shocks come with a spacing kit? I could use help quickly, the truck rides like a pogo stick without these on!

Thanks!