To follow on, I think most likely supertexta and baxteriana.
I decided on supertexta because I think that the wool is a bit thicker than on most haageana forms, and it seems to be lasting as well. M. haageana forms most often (but not always) have wool in the flowering zone but do lose it afterwards.
And baxteriana because of the (I think) single central and lowish radial spine count. But you could call it petrophila ssp. baxteriana as well.