Morning again folks

I had a rusty tensioner. I could clean it up but I suspect they aren't super expensive?

But I don't know where best to buy one from!

It's 2"/50mm diam and a photo is here...

Guess something like this...?

https://www.ebay.co.uk/itm/124128502884

Hmm the width might not be enough looking at the same item but different listing with the dims...

https://www.ebay.co.uk/itm/254626919404

Or...
eBay listing number 353184718891
By Flaxspeed, expensive though at £99 but capable of up to 10k rpm
I have a full set on my turbo engine.