Skoda Fabia Monte Carlo 1.2 TSI CBZB - Alternator belt tensioner replacement and Water pump recommendations

Hi all, I'm a long-time lurker and I'm hoping to find out how often the tensioner pulley for the V Belt should be replaced?

I've ordered the parts for the timing chain Kit B replacement (the car has survived to 165 000 kms on its original, but it sounds like a tractor on startup)! Since ordering these, the water pump has developed a leak, and I thought I'd have the timing chain, v belt, and v belt tensioner all done as well.

Also, any recommendations for a water pump? Likely I'll order genuine as it looks like the current one fitted is aftermarket and has only just made it to 5 years of service.

Regarding the V belt tensioner, am I required to replace the entire assembly (part number 03C145299Q), or just the pulley (part number 03F145276)? If I replace the entire assembly, likely Ill order an SKF one.

Thanks.

Edited 44 minutes ago44 min by VNZ00