What’s the best aftermarket brand of valve cover gaskets and harness?

 

Some have had luck with Dorman....me? Motorcraft.

 

I'd figure out how to make my own before letting go of a dime of my money for anything with the Dorman name on it.

 

I did the same... Installed OEM gaskets and harnesses in 2018 and they were a perfect fit. I figure if the others lasted 250,000 miles, why not...

^^^

Although, recently I purchased an ignition terminal rubber cover by Dorman for $1.50. I split it in half and covered the high pressure steering line square fitting, just for good measure.