Sd.Kfz.234/2 PUMA

REM-xfjplqso79-Trez
I'm not so sure about the ammo bins. There should be 55 rds or according to US sources 51. Here is the breakdown:

RACK - nominally a ready storage system where rounds are easily and quickly accessible - either horizontally or vertically

LOCKER - an enclosed storage solution nominally with a lid

BIN - typically an upright vertical storage with up to a third of the round exposed - either nose up (Panther) or nose down (Jagdpanzer IV L/70)

7 x rds in RACK both sides of vehicle - bellow the turret and maybe stored upright with clips (?) = 14

16 x rds in LOCKER forward left = 16

21 x rds in LOCKER forward right = 21

14 + 16 + 21 = 51 rds