Hi I have a pair of rockshox SID team forks that had the steerer tube cut for my old Serotta CTI. I now want to use them on my new old frame but I have my stem top 10mm above the steerer tube. I would like 3to4mm. My idea is if I fit a narrower headset I may buy 3mm at either end.The cups are externally approx 10mm deep each so if I could get a set with say 7mm cups I can get back to my ideal set up. Can anyone help? Colin. PS I have the smallest stem I could find at 40mm.