That's very close to a Head TK82S L2 grip size. When I changed the pallets of my Prestiges, I also measured and it came out as this:
A = 31mm
B = 27mm
C = 31mm
that's just an average among all the pallets I've measured. The funny thing is that I got some differences among the pallets, some going up to 28mm in the B measurement. And that was a difference that was easily noticed while playing.
4 Head IG Radical MP - Pacific Poly Force Xtreme @ 47 / 332g / 7 pts HL / SW 325 / TK82S
Gamma X6-FC // Member of 18x20 club