Yep, this is the OEM gold link bracelet. As far as third party goes, I know
@Pitch has a pretty good one, but I dunno if he's active around here anymore and the store he bought it from might not even exist. A lot of these gold link bracelet sellers just buy in bulk from AliExpress and similar websites. I'd honestly say that's the best place to check. Some sellers have warehouses in the US, others don't, so you kinda have to shop around. There will be eBay sellers that sell them too, but probably for a lot more than they cost at AliExpress.
I posted photos somewhere (don't remember where, probably not on MacRumors) of my OEM link on the S4/5 and S6/7/8 gold stainless models side by side. Here's the photo from my Discord. you can see not even *mine* matches either one exactly. I think it matches the 18kt Edition best, but I obviously don't have one of those.
Series 6/7/8 on the left, Series 4/5 on the right.