Hi, I have been bying parts saws and building up good saws and have a question. Did stihl put two different stock electronic ignition modules on the 031av. I have one that has the little square box the bolts onto one of the coil bolts which is what I am used. and the other one has a bigger plastic piece that bolts right into the bolts that were used for the points behind the flywheel. Is one an earlier model? I would like to know which one is the best to use because I have an extra of both and want to put the best in my saw that I am building up.