They are still listed in the custom catalog. You may not be able to add them by direct ordering on line, but your fitter or contacting the online assistant from direct ordering should be able to place the order with that shaft.

Should have added -

Your irons came with a single serial number. You can use that number to get the same specification for this add on iron.

I am 75 and my swing speed has slowed down. I played the kbs tour 90 shafts for years and loved them. Switched to graphite a few years ago and have not been happy with the dispersion and control. I found a great deal on a set of titleist 2021 t100s irons with zelos 6 steel shafts. About the same distance as the graphite, but I have been really impressed with the dispersion. Still in the honeymoon period, but I feel these are a good option other than graphite.