Weber Bearing Size?

[65 Lotus]

I've determined I'm getting a vacuum leaks around the throttle shaft bearings on the 40DCOE18 Webers on my S1.

Hey, they're only 40 years old, doesn't anyone make stuff to last anymore?

Would like to replace the bearings with sealed versions. Anyone know the bearing size of the little buggers (i.d., o.d., width) or a suitable replacement part number?

Thanks,

Scott