Hello,,I am a new owner of my 88 Pachanga 22 and I want to replace the complete water pump in the lower unit this spring..I have found different kits available,but I will only use OEM parts. The main part # I have found is 46-96148,,some have a Q8,A8 etc. after this #..Can anyone help me with finding the correct # and what are the differences in the final 2 digits?? Thanks to anyone that replies!!!!