I did the same on both bikes. It seems Hayden tensioners are not available but there are knock-offs being sold on Amazon/eBay. Not sure I would trust those...

 

I have two of those knock offs on the bench at home. First one arrived covered in rust, I sent pics to the seller and they sent me another one, apparently from the same box, that's covered in rust. I gave up. I've wasted $70 in dumber ways before but this wasn't my finest moment of judgement.

 

I have purchased items from eBay that went straight into the garbage. Just another form of gambling...