Have a rubber mega flat seat that needs a new bracket? No need to search all over, we have you covered with our replacement mega flat seat A bracket. It is compatible with our rubber mega flat seat (Seat Sold Separately). Each bracket comes with 2 locking nuts and 2 washers. Bracket measures 8 ½ in from top to end of thread, I.D. spread between each thread post is 4 5/8 in and length of threads is 2 in.