Additional recommendations: my Sahara rear blade is a pain, as it doesn't rotate away from the glass very far. So, take the assembly off first. There's a small plastic cover over the attachment bolt that comes off easily. Take the nut off and pull the blade assembly off. Note, the assembly is knarled, so don't rotate it, pull straight off. My blade, and the NAPA replacment blade has a metal strip on each side. I used the old ones, they were alittle more solid. Feed the new rubber blade into the channel first, then slide in the metel strips.
Note, with the plastic cover off you can adjust the direction of the squirter, the black plastic cap-looking piece on the end of the bolt; it has a flat on one side.