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Replacement or alternative?

I am currently running a Shimano Sora 175mm Crank arm set up on my Pinnacle dolomite three. After several people's attempts to remove the stock pedals, it appears to be impossible. As such, my only option is to change the crank arm of the said pedal in order to install my new pedals (and before you say it, we've tried everything in or out the book to remove the pedals)

My secondary problem now appears to be finding the left crank arm for a Shimano sora. It doesn't appear to be stocked anywhere, new or second hand. 

As a newbie to the world of bikes, could I use an alternative Shimano crank arm or would they have to be identical sub-makes? 

Here's the spec for reference: 

Shimano Sora 50-34 170mm chainset, Sora bottom bracket, KMC 9-speed chain, Shimano CS-HG50 12-27 cassette. Shimano Sora shifters & derailleurs. 18-speed, 34-112in. 

If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.

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