The WIX 51050 filter is a bypass style filter with a built in flow control orifice. Does anyone know the size of the orifice?

There is a WIX 24755 base for that filter. It has 1/8 NPT hose/line ports; however, the size of the flow control orifice in the filter is what matters.

Here are WIX 51050 equivalent spin on filters

I cannot fine a spec for the orifice, but some people say it is 1/16"