Yes I will be restocking the IS42/52 20R and 200R tapered head tubes in 170mm , I do have stock of the R20 taper in 180mm and 200mm here at BFS , just had not made it to the webstore , so I can get you sorted if you guys need them
I am working on a restock of all my tapered head tubes in both styles and will be adding the 180mm and 200mm length for the R200 style as well and this restock
I have never had a request for a 190 , not that I cannot get it , just from most of my request a 180 to a 200 was what most asked for , sam for in my 50/48 head tubes as well.