Par4QC 6i now is around 37.888, when it used to be 37.5 or shorter. So, when I want a set of 6-PW, I know to order 7-GW, plus 1/2". If they feel light
My Sim Max OS irons were ~ 1/4" shorter than my G400's. Yet TM has the Sim Max OS 6 iron spec at 37.88" and Ping has the G400's listed at 37 5/8". 😕 Who knows how they measure. Anyway, I had my Sims lengthened 1/2". I have the Ventus shaft and they're fine for me.
I did order a Sim2 Max OS sand wedge awhile back (no Sim Max OS originals available) and asked for 1/2" over. It came standard length. So I extended it 1/2". I'm going to order the Sim2 Max OS irons this week and will request 1/2" over. Hope they read the spec request this time.
Also, I have not had my Sim Max OS irons checked for swing weight. I assume with the 1/2" added it'll be ~ D3. My G400's I had made to a D1 swing weight and they are D1. I'll have my Sim Max OS irons checked for swing weight this week when I go and order the new Sim2 Max OS irons from Edwin Watts.