Nope: those are 18-round Type-155 pods. I mean the 6-round F2 pods, which are roughly half the diameter of a 155.

Ah! right, just counted them, and they're not 18-round either, there's only fifteen holes ----

what ones are those then ?

I have some even less than that if I can find them.

EDIT: hmm! I found the ones which are smaller in diameter which I was thinking of, and you're right, I count 18 holes, double checked the ones on my Turbo-Terrier and they have fifteen.