Can someone clarify the Hartzell AD on A hubs for me???

I am confused about the AD/SB and how it requires to experimentals. Can a hub with an A suffix (hub S/N ending in A) be used on a RV after the December 07 remove from service date for an acrobatic certified aircraft?

The way I understand, the older non suffix hubs can be used, but require the ECI. The A and B hubs do not require the 100 hour ECI, but the A hubs needed to be removed from service from certified acro planes last December.

What does this mean for an RV-8? I would guess this has been covered, but i wasn't able to find it.

Thanks--Lance

Here is the AD 2006-18-15

http://rgl.faa.gov/Regulatory_and_G...1E300579240?OpenDocument&Highlight=2006-18-15

Here is the old 2001-23-08

http://rgl.faa.gov/Regulatory_and_G...B090063A4BC?OpenDocument&Highlight=2001-23-08

Any thoughts????