01 gasgas 250 ec jetting help

[acmetrapper62]

I have 01 gasgas 250 ec. I ride at around 1,500 feet ruffly. With 50:1 93 octane mix gas . It used to be 32 :1 and I want to change it to 50:1. The needle that was in it before was nozf with a 38 pilot and I could not read the other number for main jet. I have a needle laying around n1ef idk if it good for my bike or what jets to use with that needle . I just need some advise on what jet to go with the n1ef needle with 93 octane fuel 50:1 br8eg plug 1,500 feet