I know you can get the straight back grips from S&W and that Hogue sells rubber and wood grips. How about the S&W arched and palm swell grips?

Were they factory options or just on special/specific models?
Can you buy'em anywhere (I've had no luck searching so far) or is it up to just posting WTB and browsing WTS forum ads?

Your info is much appreciated. -WS