This was harder then I thought. I checked the parts list that came with my 9580 but the number on there didn't match anything on Kato's site. Now I did compare 9580 to 9776 which uses part number 922177 and is different then 9580. So I checked 9581 which was part of the second run of the BN SD70MAC's in the executive scheme and the handrails are the same but the parts list shows part number 922179 which does appear on Kato's site. So it looks like for some strange reason they changed part numbers between runs. You will need part number 922179 SD70MAC Handrail Set, BNSF Green (Mid-Phase Version), which is lucky since it shows in stock while the late-phase it out of stock.