I know this is an old, very long thread, but wanted to give my account of install of the Evitek F2 in my 2001 ST1100. I've read this post in its entirety. Thanks to the many quality contributions which made my install much easier.
#1: Ordered one set of Evitek F2 from Cindy at
cindy@evitekhid.com on June 1. I had emailed her earlier this day and she responded quickly, with a quote of $46.80, (USD) which included shipping. She requested I make this payment through paypal at email:
linglay@126.com. She confirmed payment received on June 2. Confirmed shipping on June 5. I didn't actually receive them (Vancouver Island, BC) until July 20th.
2: You must use the adaptor rings on the ST1100. I ordered these:
https://www.amazon.ca/gp/product/B06Y6LZ6MK/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
$19.95 CAD shipped.
3: I think if you have small hands, are flexible and have a good understanding of how everything fits in there, you can probably do this going from underneath the fairing and thus avoid some disassembly of the fairing. I was able to remove the bulbs using this method, but you are working blind when reassembling. I decided to remove the windshield and the two other trim pieces. The removal of these pieces is literally a 5 minute job and probably suits the majority of DIYers here. I found this job much easier by removing these pieces. Both methods are previously described in this thread and I won't add to that.
-what wasn't clear to me previously was the new F2 bulbs allow the removal of a ring which is forward of the flange at the back of the bulb.
Removal of this ring allows reinstall of the rubber boot without cutting it. The bulbs fit in there with what appears to be adequate ventilation of the little fans and the bulbs, housing, wiring and ballast all have a have a high quality look and feel to them. There is adequate room behind the fairing to secure the ballasts and wiring using a couple of locking nylon straps.
4: I'm not much of a night rider anymore and but really wanted the sharper light penetration of LED lights for daytime conspicuousness. I did try them out after dark, however, and the difference is.....stunning. I did not have a single oncoming vehicle 'flash' me during a app. 10 km after dark ride.