After market steering stem and another Jetting question.

Hi everyone! It seems my 2003 Raptor 660's steering stem is worn and needs replacing. I have already replaced the dog bone that connects the steering stem to the tie rods with lots of play. I have looked into the Houser anti vibe setup, but I don't want to spend that money on a steering stem. I found a stem that looks similar to the Houser at 1/4 of the price, but I have not been able to find anything that says positive or negative about it. I am putting the link down below. My next question is about jetting. I am putting a DJ stage 2 set in, but I am not 100% sure of the jets or pilot jets I need in my machine. I am 1700 feet above sea level and have 2 50mm holes cut in my airbox (fear of water getting in my airbox) and a slip-on exhaust. I was told to use #25 or #27.5 pilot jets and don't know which will fit better. I also plan to run 150L and 155R Dynojet and feel confident about that, but I would like input. I know it is about trial and error, but I would like a good place to start. Sorry for more jet questions lol. Thanks, everyone.