One quick question guest. What series machine is behind your 600 series head? We have the three 635 hydra flexes on 50 series sts. We did have to make our own wedge kits for getting the best pitch on the SCH gaurds. And we have 3 stinkin different front tire sizes on the three machines. So each wedge was custom. So if ya have the 60 series that adjustable feeder house pitch will be nice i bet. But if ya don't ya might have a little customization to do! good luck and have a safe and profitable day!