Upper Ball Joint Spacer/shim?

[ibrown50]

This may be a really dumb question but......

I am fitting new upper ball joints to my 64 C10. The base of the rubber boot, where it meets the mounting plate, has a spigot which is a larger diameter than the hole in the control arm (by approx 1/4" - 5/16").




When the ball joint is pushed through the hole it cannot go all the way through and sit flush and therefore leaves a gap,



It's months since I stripped the control arms and the old ball joints are long gone so I've nothing to compare them to.

So my dumb question, am I missing a spacer or should the ball joints pass all the way through the hole?

Any advice appreciated

Cheers Ian