The filter I got is a bit larger than the plastic original one, but is a steel one, think it will fit in the tank, but that nice ribbed pipe is too small (even if I could get it off) diameter wise to fit the new pump. The Bosch pump I got is widely available, even Goldwagen has an identical one for only R375.
Maybe I should try a hydraulic shop for the right pipe. The replacement pump operates at 3.88 bar. Does anyone know if that is in the ballpark for what we need?