878408A 1 - O-Ring Kit
See the tech info sheet for additional details and contents, BUT please note, 878408A 1 contains o-rings for the cylinders only. Does not contain all the o-rings for the entire assembly.
Your best bet will be to get this kit and then order additional parts indiviudally as needed. The photo of the kit is correct, but it does not contain everything in the tech sheet.