Replacement for Bryant Type BRD BR 15-15 CU-AL SWD circuit breaker
Bryant is now replaced with Cutler Hammer products. A cutler hammer/eaton reseller would be more than happy to take care of you.
And if memory serves me right you can get a BR1515 non CTL breaker. It will fit right in there.
It would run you about 10-20 bucks.
"Do it right the first time and avoid duplication of effort"
Your AHJ/Inspectors ALWAYS have the final say on ANY electrical code issue.
If in doubt, contact a licensed, experienced, reputable electrician to perform the work.