Pictures are great. Im sure John would agree the numbers on the parts wont necessarily tell you what mower they came off,only the serial number will determine this. And he has stated that the 402x was a generic code for many mowers,so maybee we will never know on the 402x 98 cc Midget. To confirm dates of engines Unkie,you need to remove the pulley and alloy housing off the flywheel to see the code stamped on the inner rim of the flywheel. This will give you serial,month and year. So for your 5G (pace confirmed engine) you should be able to verify the model it came off by matching it with the Pace model codes for that year. Since it will be a "standard mower" being only small capacity it should be easy to determine. A Pace 2V70 Or 3ST "Standard Seem likely