Please ensure that the number registered on the seal to be changed is the same as the current number 12-32-55 Zenoah G320RC / G320PUM Large Oil Seal 12-32-55 Replacement large oil seal for the Zenoah G320RC / G320PUM engine only. Does NOT fit earlier Zenoah RC models (230RC, 290RC, etc). For the small oil seal, see part # dd001. Zenoah part # 263043150