I found the connectors that AL use on their bi-xenon projector solenoid control boards (Mouser #571-2-1718346-1 and #571-965906-1-CT) and ordered a few to make pigtails that connect the high beam solenoid into the factory wiring. The OEM connector locks securely into place, and the 12″ (30cm) automotive GXL wire is designed to hold up inside of the headlight housing. Wire is color-coded to match factory wires (yellow = +12, brown = ground) to ensure correct polarity and not look out of place inside of the housing.
AL (OEM) Salvaged Projectors

Most used (salvaged) projectors come with short (cut pigtails) of various colors or no harness at all. I have never seen a set in yellow and brown, the wire colors used in the Volvo headlight housing for the 9005 high-beam connector.
If you want to wire up a projector retrofit without using messy splitters, I am selling these for $20 shipped (Priority Mail) to the US, or $12 with your SKBOWE order (just contact me first!) anywhere. Each order comes with a pair (2x) of 12″ GXL pigtails and four (4x) 4″ black zip-ties to match the OEM internals. You will need to provide insulated butt-style (if you cut-and-splice) or 9005 female (join inside of the high-beam connector) crimps – see this post for details.
Replica Projector Pigtails
Replicas use the same connector but a different pinout: the yellow wire is on the center (pin 2) rather than on the end (pin 1). All new replica projectors come with pigtails, usually white (+12) and black (ground). These will work fine, but if you want to go for a 100% OEM look, you can order a set of these color matched pigtails and swap the pin across. It is pretty easy to swap the pin over using a jewelers screwdriver. Or let me know first and I’d be glad to do it for you.