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I was looking to see if these even existed outside of having to create my own. Any ideas? If I were to create my own any suggestions on going about it?

Short of sculpting your own there are no solutions as far as I'm aware.

http://maxmini.eu/conversion-bits/melee-weapons-shields/necrotech-power-fists-bits

or

Cut down the claws on a CSM Terminator Lord Lightning Claw?

There's a ton of both left and right handed fists in the raptor box, which will never get used since warp talons are terrible. Either buy some of those sweet new models or just find the extra bits from an opened box at a bits store.