You could try model V40B serial #79M followed by a number around 2000, like 79M2205. The linkage rods from the petal back may be tricky to figure out but the pivot on the manifold should be all the same. The muffler is probably a 333159 if it bolts on right to the exhaust manifold. If you have a Cat dealer nearby ask them if they have a paper parts book you could take a look at for V40B with Continental motor. My local dealer has a huge library that comes in handy for old machines.