If you don't find that part or your willing to try an alternate way of attaching those headlight washers I'll show how I attached mine.

I dug around in the garage and found a piece of hard rubber hose that has an inner diameter close to the headlight washer. I then cut a piece off about 1/4" in width. I then cut that piece lengthwise and ended up with this:



I dabbed the inside with a little RTV or silicon adhesive and stuck it on.

It's not pretty, but a it's cheap and easy way to keep the headlight washers from flopping around. I did mine about a month ago and they are holding up...and if they ever do fall off it's a 3min repair job.