Fast Grass, i dont mean to nit pick, but just for those who may read this, to eliminate conffusion, with your "mustang VC 160 (80 Series)" i'm a little thrown off, there is a VC-Mustang, there is also the VC-160, and the plain Mustang, the VC-Mustang never made it past 1976, whereas the series 80 engine was released 1980. I would guess that you have an early 80's Mustang, with a series 80 Engine.
I have noted some confusion that the term VC refers to full crank engines, this is not the case, VC preceeded the names of some mowers between 1970 and 1976, the VC-160, VC-125, VC-Mustang & VC-Sports, etc, These mowers are badged with the VC before there name, if the VC is not there, then it is not a VC (exept where badges are missing or incorrect), the VC name was also used in advertising to refer to the mowers of this era.
Not trying to have a go or anything, just making sure people get the correct information when reading through.
As for the inside of the wheel missing, yep that seems to plauge the later wheels, its why i prefer the heavy ones, with the solid tires, and would love to find somwhere to get them!!