Friul tracks are good...
but the...(spiked wheel at the rear, don't remember the name) provided by Friul has the right number of spikes and doesn"t fit into Tamiya dot..........
Try to centre it with a rod.
KV-1C is a wrong designation provided by TAmiya in order to stick to other KV-1A & KV-1B
I don't remember xhich one they designate as "C"; but the rounded turret is a "KV-1 mod.42" (or late '41) and the one with bolted plates on turret and glacis is a "KV-1E" E for Ekranami (reinforced)