Not sure my 2007 post reads that the O-240 powered Aerobats had a different airframe....
What I appear to have written in 2007 was that the Aerobats (A150, FA150, FRA150, A152 and FA152) had beefed up airframes as described. Struts have a wider chord - good gotcha when ordering strut end cuffs (fairings).
Aft of the firewall, the FRA150 was identical to the other 150 Aerobats. Top cowl was modified with blisters (as described earlier), not sure if the lower cowl was different. The propeller was different with the O-240 powered aircraft.