Left handed 870 20 gauge

[Proforce99]

I know Remington only made the 870 in a left handed 20 gauge for a few years. I have searched for one for years but only ones I found are at exorbitant prices. It is my understanding that a 12 gauge can be converted to a 20 gauge with one of the early model barrels that was built on the 12 gauge frames. Is this possible and does anyone have a list of the necessary parts

[Scorpion8]

No sure if finding the LH parts will be any easier than a LH model.