You mentioned an E55....most use the SL55.
It would be interesting to follow this as it may open up another option for us (if not already).
Here's a previous post on the subject...
https://www.crossfireforum.org/forum...tml#post672474
which contains a link to Brian the Brave's install.

I also recall the 32Krazy and Grip Grip did the SL55 install.