This Soap Dispenser is inspired by the MK2 Grenade also known as the Pineapple.
The Copper colored Pumps have been taken off from Rituals Hand Foam. Unfortunately they don't sell those anymore.
The Clear Pumps i have purchased on Amazon https://amzn.eu/d/8kRbQPh and they fit perfectly.
You may find a lot of other Foam Pumps, as the neck size is pretty common 40mm (1.57inch), 410 thread.