I have looked on Koni website and found the 8610 and 8611. Which seem to fit into my HP Fiesta tubes. Having not ever replaced them, I'm doing the research to find the best fit without too much fab work. I will check into Behlings
If you can get some dimensions on the Fiesta strut that you would be using, I would be happy to help you out with any KONI info that you need as I work for KONI and am quite familiar with the 8610 and 8611 RACE units. You can reach me by PM here (don't check in as often as I used to) or ny email at lee@koni-na.com.