I just received the Ultra 5's for my Amati Futura's.
Unfortunately, the adapters Stillpoints makes for them dont work.
Many thanks to Ivan who made several calls to John and Paul from Stillpoints to figure a solution out.
The ideas floated were:
-remove the Amati lower base plate and rubber dividers altogether and attach the U5's to upper plate with adapters.
-place U5's tapered side down and let the speaker spikes sit in the larger hole.
-place U5's tapered side down without the spikes and rest the OEM thread from the rubber dividers sit in the hole.
I installed the U5's using option 3 but wont be able to do any real listening for a few days.
Initial impression was positive with immediate clarity in mid range detail.