So a few weeks ago I decided to explore the possibility of adjustable shocks for the ST. And since nobody makes any yet, I thought I'd try a trick I found on the web... A guy at nationals in a focus ST dropped the bottom out of his stock struts and installed double-adjustable koni race inserts.
http://fordstnation.com/motorsport-track/6402-koni-double-adjustables-completed.html
So I bought one stock strut to do some measurements. The left one. Which it turns out is literally the mirror image of the right one, and yet the left one costs $70 while the right one costs $50. I mean, they're identical. Go figure.
Anyway, I did the measurements and figured that an 8011-1259 insert would fit about perfectly.. Certainly within the +/-1" overall length that the rules allow. It has a 6" travel vs. the 6.5" travel of the stock struts. I figured I could add extra bump stops somewhere if that half inch was really a problem down the road.
I also began looking for some trashed struts that have removable guts... Ones with interior threads, so that I could weld a section of them to my stock strut tubes. Well, I never found any, but I grabbed a couple hefty crimped ones from the scrap pile at a nearby repair garage anyway (with permission). They look like they might be from a Honda Odyssey.
So I ordered the other stock strut, the Koni inserts, and started to work.
First I practiced on the honda struts...
And I cut a couple 4" pieces off the ends to play with. They have the same 2" od that the fiesta struts have, but the wall thickness is much thicker.
Then I cut up a fiesta strut, being even more careful not to get sprayed by drilling through a plastic bottle bottom. It wasn't really necessary.
The koni drops in nicely, the length is right, and the thicker wall of the honda section hugs the koni that much better. All I need is some 48mm dia x1.5mm pitch threads machined ( or tapped) into one end of the sections, and I am golden.
Finding someone who can run metric threads on their lathe is proving harder than I thought.
I haven't given up looking for some donor struts. I may check at local body shops for struts from mashed BMW 5-series cars.