2 pin switch connectors

[WillAdams (William Adams (Carbide 3D))]

Molex:

Limit Switch Connectors

Those are Molex KK-series .100" pitch 2-pin headers. The mating shell is (for example) http://www.digikey.com/product-search/en?mpart=0022012027&vendor=900 and the associated contact would be (for example) http://www.digikey.com/product-detail/en/0008500114/WM1114-ND/26475 If you’re in the US and have a Fry’s Electronics near, they sell the shells and contacts.