Product review (2 stars): Not Genuine Whirlpool FSP Part
This is not a Genuine OEM Whirlpool part, at least the one I got from Supply Edge.  The listing Title does not mention it is non-Whirlpool, and the the listing says "by: Whirlpool" but if you read the fine print is an aftermarket part.  I was able to google "3387134 China" and found an exact photo of the part that was delivered to me made by a mysterious China company.  Personally if I'm taking 15-30 minutes to replace this on my dryer, I'd spend the extra couple bucks to get the Whirlpool OEM (aka FSP or Factory Service Parts) so I don't have to open it again in a few months when it breaks.  Search "3387134 FSP" on Amazon and buy from one of the listings that shows the thermostat with an FSP bag.