G'day sparker,
You seem to have a GCV190 there.
There should also be a serial number [5 letters/7 numbers], stamped on the rectangular pad above the oil filler. With that, we can find the right parts list, at least.
As far as I can tell from the parts diagrams, it looks like there are 8 sump bolts. Have a look underneath - you may have to clean crud buildup out of recesses to see them all.
