Hey all, Have a question about carb kit i just bought. The old needle valves have the rubber tips to seat it . The new kits come with stainless steel ones , no rubber tips. Is this acceptable as replacments? Seems years ago you had brass seats and ss needle, but the seats were replaceable too. These seats are not. 2000 90hp merc. 2-stroke 3-cyl. Carb kit Sierra# 18-7750. Thanks for any input