Crash Bobbin's for the axle's. I can't remember who made the Frame Sliders. I will tell you this. From what I have seen of people mounting frame sliders, they had tried to use a bolt that was too long and stripped out the block. These fit perfect.
Everything is marked as to where and which way they mount, with tywraps holding the bolts/spacers in place.
Thanks,
Daybreaker