Even if you swap in the Gold E metal the wood will be wrong because the Optima barrels are a different diameter from the Mobil used on the SS. Talk to a gunsmith who's confident with wood because it might be fittable.
Many thanks all for your replies and time. You have really confirmed what I thought it was just that a saw a really nice stock and forend on Guntrader but, you have convinced me not to risk it.