Power window regulators?

I have an 87 b2000 which it doesn't matter, but I want power windows. Is there any stock power regulators I can search for that will be an easy or minor install or do I have to go with an aftermarket power window regulator kit? Thanks all information is very handy.

aftermarket will probably be easier to install.

You can always get the power windows from Australia. Some of the mazdas came with power windows over their. If thats out of the question then I would get a SPAL window kit.