strut mount / top hat stiffening possibility?

[lilbrudder]

i have my struts off and i noticed there is a gap in the top hat that has rubber around it but looks like if it were filled all the way with rubber it would decrease body roll any one tried some window weld rtv in there? it's hard to explain where i'm talking about so i'll post pics later. does anybody know what was changed from the original top hat and the revised one they sell now? i'm trying to figure out which ones i have.