I just bought a brand new AISIN OPT-027 oil pump for one of my 3VZ-Es. I wasn't expecting it to come with any seals. The pics didn't show any included. So I went ahead and bought a front main seal and o-ring for it separately. Made my own paper gasket for the oil strainer/pickup tube. And I'll be using RTV for the housing-to-block gasket.

Anyhow, the new pump shows up today with the paper gasket(the one I already made) and an o-ring. Cool! But I've got no use for either of them...and it's the wrong size o-ring. It appears to be a 21mm x 25mm x 2mm. Which will not fit in the place for it on the block. The correct size, in case you haven't seen my thread on it, is 18mm x 24mm x 3mm.

I wouldn't have expected that from an OEM such as AISIN. But I guess it proves even they get things wrong sometimes.