DIY Mercedes Benz change drive serpentine belt, tensioner pulley replacement CLK C 320 V6 3.2L M112

The drive belt in my CLK320 shredded, so I replaced it along with the belt tensioner and upper pulley. Not a difficult job and easily done by any amateur home mechanic with a few basic tools.
The Mercedes Benz M112 3.2L V6 was used in a lot of cars in the early 2000s, including the CLK320, E320, ML320, SL320, S320, G320, C320, SLK320, and even the Chrysler Crossfire (phew).
Links to amazon products - as usual check with the vendor with your VIN to ensure you get the correct part, especially for the tensioner and upper pulley!
amzn.to/3PBJnu5 e torx socket set - to remove tensioner, pulley
amzn.to/3vzDMxz 1/2" breaker bar
amzn.to/3Vvj50g 1/2" socket set (use the 17mm on the breaker bar to release the tensioner)
amzn.to/3xafQl1 6PK2385 drive belt
amzn.to/3TuiRUE CLK belt tensioner
A000 202 0019 upper pulley

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Does Anyone know how to replace JUST the pully on the automatic belt tensioner? Why spendmore than you have too?