90 Degree Gas Bottle to Regulator Adapter?

[Steph]

I just picked up a E size bottle of tri-mix gas for mig welding stainless, and found they didn't have any side-outlet bottles available, which is what my regulator suits. So I'm stuck with a top-outlet which means the flow meter is horizontal, so I can't adjust it as the ball just sits there, rather than floating. My question is; is there a 90 degree elbow that can be used to mount the regulator at the correct angle? The flow meter can't be swivelled around, as no matter what position it is in, it remains horizontal.

Steph