Amazon's exclusive R5-D8 (The Black Series 6-Inch) is unlike previous versions of this specific droid.  Previous representations usually look a lot like R5-D4, with the blue arm panels.  Some even have yellow stripes in the red columns on the chest.  This one is colored almost exactly like the 1979 Kenner R4-D4, which doesn't mean that it necessarily matches the on-screen droid that served Jek Porkins - but there's not a lot of reference, either.  Read on!