my0wnme

hi,im new to nitro rc and recently got a magnum nx second hand of ebay,i wanted to know which brand of spurs will fit apart from the cnc metaal ones,i want to stick to plastic one because there cheaper if they strip,also which airfilter foams do i need for the stock airfilter that came with the nx18?
also any other info and upgrade reccomendations will help,i understand these share a lot of parts with the mt2??

thanks