No need to mark the brackets. Replace them all at once and just tighten them up with appropriate deflection. Don't over tighten the belts, it puts undue strain on bearings and pumps.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.