Hi Frank,
Thanks for the link to the mbx5 manual.
I have the manual in hand too,
When you look at instruction no. 24 (tension rod)
the part no. is C0107A (that attaches to the rods E0114/5).
I've been looking for tt part, no one seems to have it.
But C0107A is very similar to C0115 "upper arm link MBX"
(which I oredy have), i'm wondering if they're the same??