In-tank fuel pump and sender unit 2012 Monte Carlo 1.2TSI (105)

The wife's fuel gauge is sometimes reading 1/2 a tank low. Out of changing the fuel gauge itself and changing the sender unit, I think the latter looks much easier (and cheaper) to try first. Any suggestions please?

Otherwise, can anyone recommend a replacement in-tank fuel pump and sender unit for a 2012 Monte Carlo 1.2tsi (105)

I think the part number is 6Q0919051F. There's a Ridex one on Autodoc for £55 including seals. Anyone know if it's any good?

Cheers.