Troy Bilt Sickle Bar Knife Section part# P406658 has a base that is 2" wide. The cutting edge is approximately 2-1/2" long. There are two 3/16" holes and one 3/8" hole between those two for the purpose of mounting the knife section. We do not have a list of models for this knife section, so please refer to your owners manual for the correct part number for your specific model.
Also includes two mounting rivets (#p406657 not pictured)