Yea the kits are pretty sweet.
Ive already used a bunch in my kv-2 & tiger.
The Tiger REALLY needed the hex head bolts to hold the idler on and for the tentioners.. before they were just the really small 1.5mm driver 'grub screws' that LOVE to strip out... these bolts can be tightened down now without that risk.
Tiger I - Panzer III - Panzer IV - Chi Nu Kai - Panther G - KV-1b 756(r)
M4A3(76) Sherman - T-34/85 - M3 Grant