Leaking Valeo cooler lines, what things needed to switch to Behr

[Arzaam]

Noticed my w203 having some seepage around the cooler linens though I have also never cleaned this area in years. It has the factory 16 year old valeo rad now so I thought ill replace it anyway had a glycol test done today came back negative so no damage yet but ordered a new rad anyway it would be here in a month costing 500 quid but should be worth it.

Do I need new o rings on the quick disconnect coolant hoses? already ordered new o rings for the transmission lines anyway,

Do I need new rubber bushing mounts for the radiator will existing one fit the Behr?




currently this is my leak

 

[Arzaam]

are the lines hard to install back as this video seems to prove? anyone had a similar experience to this person?