whitemr2gt
I have some new Koni yellows for my SW20 getting shipped to me at the moment, so I'm looking at ordering new OEM strut boots for front and rear and I want to make sure the fitment is ok.
Does anyone know if the Koni shock absorber shaft/rod diameter is the same as the Toyota OEM ones?

As PETE says they are the same diameter, and the stock bumpstops/boots should fit ok.
Konis are good gear, but a few things are different.
You can't reuse the OEM gland nut, and will need to use the supplied gland nuts that come with the Konis.
Check to make sure that the thread is correct; I have seen some that are not.
BTW, the split plastic washer sits on top of the gland nut to stop air being pumped into the top of the shock if the suspension bottoms out on the bumpstop.

Also when you reassemble the struts make sure that the flats at the top of the shock shaft align properly with the corresponding flats in the top spring seat. Very easy to get them misaligned.