Are these good for strat single coil?

Essentially, you can use any capacitor for any pickup. But, some go by a rule of thumb that a .022uF is used more with humbuckers, and .047uF is used more for single coils. Personally I like the .047uF with singles (especially the bridge position) because the .047uF caps will bleed off more of the highs to give you a darker tone. Ultimately, I would suggest experimenting with different capacitor values to find what YOU like. After all, it really comes down to personal taste. If you do a search on YouTube or Google you can find a vast amount of technical information regarding the subject. I hope I have been of some help. Good luck!

If I buy a pre-wire harness are these already installed and soldered?

I'm not sure I understand your question. This is an ad for a stand alone pair of capacitors. You can probably find a wiring harness that uses Orange Drop capacitors, but this is not the place.

ASIN	B07BF4KN7Y
Best Sellers Rank	#4,665 in Musical Instruments ( See Top 100 in Musical Instruments ) #34 in Electric Guitar Parts
Brand	Orange Drop
Brand Name	Orange Drop
Capacitance	0.02 Microfarad
Capacitance Tolerance	5
Customer Reviews	5.0 out of 5 stars 2 Reviews
Item Shape	Rectangular
Manufacturer	Orange Drop
Material	Polypropylene
Material Type	Polypropylene
Maximum Voltage	200 Volts
Mounting Type	Through-Hole Mount
Operating Voltage	200 Volts
Shape	Rectangular
UPC	691852991877

.022uf / 200v Orange Drop Capacitors - Pair (2X)

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