Question: IS THE PRICE PER PAIR OR EACH
Answer: Thank you for your inquiry,
Yes sir, an APC AR7221 kit (currently on sale for $160.00) includes: Qty 2 - 42U Vertical Cable Managers, Installation guide, Mounting Hardware, Qty 6 - Cable retainers with snap hinges, and a Top securing bracket.
Question: At 35" high I would need to order 4 per cabinet ? 2 on each side?
Answer: Thank you for your inquiry. If you desire cable management on both sides of the rack, yes, two sets of two 35inch Vertical Cable Managers would be required. Typically however, we see installations on only one side.
For your reference, here is a link to the installation guide:
http://www.apc.com/salestools/MLAN-967N8J/MLAN-967N8J_R1_EN.pdfQuestion: Do these fit most racks?
Answer: Thank you for your inquiry. These are designed to mount on the NetShelter SX button mounting points and are not a universal fit.
It is possible this Vertical Cable Manager Kit could mount in other racks, but it would depend on if the button mounting points are available and in the correct positions.
Either way, we could not guarantee it would work in any rack other than a 42U high NetShelter SX enclosure.
Here is a link to the PDF drawing that shows the locations of the "buttons" and other dimensions of the kit:
https://www.apc.com/salestools/SCUA-9DNRQW/SCUA-9DNRQW_R0_EN.pdf.