This is the correct part number (A620006) for the 62024P-600-8 DC Power Supply, but the reason why the rack kit will not initially fit the DC Power Supply is because a minor adjustment needs to be made to the side edge of the DC Power Supply (see picture below) prior to mounting the rack kit. there is a small adhesive sticker that needs to be removed. The only tools that you will need to make the adjustment are, a small exact-o knife or a small flathead screw driver.