[Q] Install Stock Kernel topic

Hi. Im here for a question, i have flashed a new kernel. It was DooMlords advanced stock kernel with clockworkmod. But i want to remove it so i can use stock kernel and get updates manually. I have already unrooted my phone. And im about to relocking bootloader after i get away this kernel.. So can anyone please help me? I want to use the default kernel for sony xperia z1 c6903! Im on firmware 14.3.A.0.681 right now. So can anyone say where i find the right kernel? I dont need stock rom just the kernel! Or can i get OTA updates even if im on stock kernel with custom recovery?