Dual receive SFPs

Hi. Looking to add some more SFPs to a Cubro Packet Broker (https://www.cubro.com/packetmaster-ex32.html) that we're using to to span network traffic from a fiber tap. Currently we've used standard SFPs (https://www.fs.com/products/11589.html) in the packet broker which means we require 2 for each fiber pair that we are spanning as we only use the receive side each SFP.
Does anyone know if/where we can buy dual receive SFPs without any transmit capability so that we are able to make full use of each slot?