I'm not quite sure what year my Billygoat lawn vac is, I'd say its probably an 04 or so. Its got the older tan zipper bag. It has (had) a 5.5hp Briggs turd of an engine on it. Its been a mosquito killing fogger for a while and I knew it was on borrowed time, today it lost compression. Trying to find shaft specs and what bolt pattern it uses so I can replace it. Harbor Freight is running a special on a 6hp vertical shaft engine for $100. The HF engine mount specs: PTO length: 3.2" PTO width: 7/8" PTO keyway 3/16" PTO end tapped 3/8-24 counter clockwise rotation mounting bolt circle: 8", 3/8-24 tapped hole If this is a no go are the Honda engines some of these were optioned with compatible with a Briggs setup? I don't want to buy another Briggs, only reason I'm considering the HF unit is the incredibly low price.