Note to one’s self when you remove anything label it so you know where it goes should you need to put it back in its original place

did the Collins ones look the same? If they differed there is a chance they would have been sided, fit specifically to sides.

as for the harshness you’ll find a lot of the replacement/upgraded stuff is made out of different material and cause the car to feel different. I fitted a roll restrictor to my focus rs and it vibrated like a bitch when I first drove the car after it was fitted, so much so I thought I wouldn’t be able to live with it and thought about taking it off. It has settled down though but it’s still noticeable especially when the air con pump is running