need exhaust t for 502xl engines

[louie d]

i have a 1997 3500 express need to replace the port side exhaust t the flappers in the t have worn about a dime size area inside the tubes and have worn a small hole all the way through in 1 spot. i found replacements, centec industries, but they dont have the flappers that the originals have. has anyone replaced these and if so can you use the replacments with no flappers thanks louie