Originally Posted by Jodiuh
I've read that the 200 size fits (over on the other GR07 thread) but I've personally not tried it. I have some 400 size tips with me though and they do fit snug over the last knuckle, but I'm not sure how a longer tip like the P series will sound. I suspect that the size 200 tips would fit more snug on the tip of the nozzle up to the last knuckle from what I've read but they reportedly need a bit of stretching as the bore hole is slightly smaller. Comply now recommends size 400 for the VSD1 though, which has the same size/type nozzle as the GR07. I would check around to see if anyone has tried the P series tips over on the other threads.
You may want to check this out though:
In the comments based on his tests, Rin recommends avoiding tips that are longer and/or with thinner bore holes, which kind of rules out the P series. If you were to still want to try Comply tips though, I'd personally suggest the Ts series most likely given those results.