"Also we don't have a FW 190 with Mk103 gunpods, which did see combat in small numbers too."
And the reason for rarity in use was that they could not get MK103s to fire sychronously, so if mounted in wing pods as in A6/R3 and A8/R3 the momentum of unevenly firing cannons would start to yaw the plane and the accuracy would suffer badly. In fuselage mounting this was not a problem as in Me410.
I wonder which saw more use in Me410, MK103 or MK108?
***
"No, I was. It's actually a 101, the precursor of the 103."
Actually you were right. It is MK103 in the picture of mechanics loading the gun. The MK101 had a round muzzle brake and it was a bigger gun.
-C+