I am looking to replace a part on my dishwasher. It's called the cover latch in the manual. I can't seem to find the part number listed anywhere.
I was finally able to happen upon the whirlpoolparts.com website and entered what I thought was the correct name of "cover latch". It ended up being the whole assembly called "Whirlpool Dishwasher Detergent Dispenser WPW10195175".
A quick google and ebay search showed your part available there for about $125 (Canadian). I doubt, you will be able to find that tiny plastic piece separate as per the link you listed and the schematics. I would also check local repair shops, they often have pieces and parts (new and used)for sale.