This is more a question of what will be acceptable to you. First of all, google rolex 5510 and look at at the various inserts- a lot of them have the red triangle.
WSO990 has one of those
https://www.ebay.com/itm/BEZEL-INSERT-FOR-ROLEX-SUBMARINER-5508-5510-5512-5513-6538-65
It's not great but maybe it'll work for you.
WSO990 also has the insert with the acrylic pearl in a silver triangle
BEZEL INSERT FOR VINTAGE ROLEX SUBMARINER 5508 5510 5512 WATCH AUTOMATIC BLACK | eBay
I used that insert in my 5508 build and it's ok- the pearl was good, font so-so.
Or go for Phong's insert- I'd get the one that's for the for the vintage subs at $95- either the vintage or new look. It's not distressed so you can age it yourself or let it age naturally.