The o-rings came in less than 2 days; can't be the service along with the price. I've had some other problems with my truck and have yet to get it serviceable so I can't rate my o-rings yet. However, I will now look to RiffRaff above other companies when searching for future parts; seems like there is no bullshit in the buying process.

Great o rings complete kit for 8 injectors. After 212k miles I changed out the o rings (they were old and brittle) i saw an increase of hpop psi at WOT from 2300 to 2600 with a T500 on stock injectors.

I ordered these and was surprised how fast they got here and was just what I need.

good product,professional packaging,fast shipping.

Great products for good prices, great seller. THANKS!

I have bought several products from Riffraff. And they're Great! Quality parts and fast shipping. Would recommend this company to everyone.

Don't cheap out. These are what was made for your motor. The fit was much tighter than the doorman. Price was the same. Shipped across the country in 2 days.

Well I learned the hard way, DO NOT go the cheaper route on these things! I purchased my 1999 F350 with a cracked Injector Cup, I installed all Doorman parts. About 20,000 miles later I noticed I was losing a TON of oil but it was not leaking out anywhere. I did a Google search then found oil in my fuel. Needless to say I had a few faulty O-rings... I made the call down to Clay and ordered these up. They showed up at my door two days later, I spent my next Saturday replacing all O-rings and now my truck runs better with no oil consumption.

Well worth the money and I was impressed how fast they got to me