28 mm O.D. for the ring furthest forward on the inside of the main body of the pump.
24 mm I.D. Dash 021. UPDATE:
Now recommending the Dash 119. The thinner -021 has had too many issues on too many pumps.
Then there's the standoff on the high pressure side.
Which has a 13mm I.D o-ring on it. Another Dash 014.
Took a few measurements of the bearing on the pump. No way was I going to press it out just to measure the thickness but its I.D. is 17mm.
40mm O.D. for the bearing.
On the very back of the pump there's a sensor and an O-ring. It's O.D. is ~15mm. I'm squishing it with the calipers in this photo to get it to stay.
The all important I.D. is 12 mm. So a Dash 013 O-Ring.