PS leak

[bigmoe]

So I finally got some time to pull this apart. I went to my local industrial supply and they had two orings, one smaller and one a bit bigger in diameter. The bigger one didn't work. Couldn't get it to slip into the pump. So I go to my local GM dealer. Parts guy says "Last 5 digits of your serial number?". He didn't appreciate when I jokingly said Don't be silly. So I go through explaining 65 truck, 08 motor, 79 fitting. He couldn't (or wouldn't) pull out any 79 parts books. He did look on the computer for a seal kit for the 08 pump and printed it off for me. It shows the o'ring i.d. as 14.5mm. The original oring measures about 9/16"i.d. which is about 14.5mm. No other dimensions in the picture. So I went to my local Piston Ring parts store and they've ordered a 79 seal kit for me.