Question, Mr Beno. I've searched the site and found some info on part numbers but no answer to my (stupid) question. I got the details on the first 5 numbers and last 5. The question is how important are the last 5? I assume quite important, but in searching for parts, I see some available that are close but not quite exact and I wonder if they might work. Example. 16210-54150 vs. 16210-54200. Can you enlighten me on thinking here? Thanks.