I bought Glzr in red and G09C in black 2 or so weeks ago, both in 1.9mm, haven't had a chance to glue them yet, but I think I'm going to exchange both for each in 2.1mm red. I have a feeling 1.9 won't be enough for me, also that G09C wouldn't replace H3 as my FH rubber anyway so I might as well...