If you want to do them yourself then you should have a jig, vanes, and glue. If you're doing this then what's on the arrows now doesn't matter. You have to strip all the vanes off and start from scratch anyway.

If you use a straight clamp and angle it a few degrees then you'll have what we call "straight-offset."
If you get one with a helical clamp then I'd recommend a "right helical". If you get a Bitzenburger jig then you could possibly do either just by having the appropriate clamp. The jig will come with whatever you choose. If you decide to change then just get the other clamp, adjust the jig, and have a ball.

Other, cheaper fletching jigs don't offer this option.