o-ring

I finally got around to pulling an injector, I'm not really too sure what I'm looking at... could someone shed some light on if I should be worried about my injectors?

So I was replacing the fuel regulator spring and I broke the keyhole O-ring and I had to use one from my O-ring box. My question is will this cause any problems? I got it to fit in the groove and doesn't leak, but is the OE ring made of something special?:confused:

This is a Write-Up on the Top Fuel Injector Seals & The Nipple Cup O-Rings in the High Pressure Oil Rail If you find a leak at one of your top injector seals you probably have a leaky nipple cup also... Don't learn the hard way like I did ~How to Diagnose and Replace~ Fact 1: The top injector...

I have the following parts for sale. Here's the parts: - 2 Ford F81Z-3B458-AA (thrust washers) - $16 each shipped - 2 National B2110 (needle Bearings) - $6.50 each shipped - 2 Dorman 81060 (Hub O-ring kit) - $7.00 each shipped All parts are BRAND NEW in packaging I could come off some if you...

Ok so my oil cooler was leaking so i got new o-rings for it and I am in the prossed of reassembling it. For some reason I can not get the front header part of the oil cooler to seat back on over the o-rings. I have put oil on the o-ring and put all my weight on it (255 lbs) and it just pops...