B4.1 and B44.1 rear arms are the same aren't they?
The only difference there was between B4 and B44/B44.1 rear arms was the extra ball for attaching the ARB on the B44/B44.1 - I would guess that as you flip the B4 rear arms that then the ball would be on the 'wrong' side for an ARB, so running B44/B44.1/B4.1 rear arms would solve that problem.
It's a guess tho as I don't own a C4.1!
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