We just got in a Xi spring perch from the local dealer and it appears that the spring perch will work. I dont know why the other shop had a problem installing the perch but after comparing the Xi and the nonXi spring perches and the Lowering Perch I dont see an issue.
If one of you with an Xi wants to try these out we will give you the perches at no charge and even cover the shipping. I just need another person to try these out and let everyone know on the forum. We just dont have many Xi's locally or we would do you install for free as well. If you are in So Cal with an Xi get in touch with me.
Email me at firstname.lastname@example.org
or call 714 632 1951 x225 or PM