Help with brakes needed pls

[gordonr]

Hi all , any help will be very much appreciated , gonna do the front and rear caliper seals on my fazer , front seals came through fleabay , seller stated nikone ones but when i got them through , both sets for the front callipers were the required 30 and 27 mm but one set of dust and inner is 2mm thick with an inner lip and one set is 4mm thick with no inner lip , can anyone shed any light if the thickness matters , never done the seals before on my bike so dont wanna start getting them stripped and find out they are wrong.

Oh and any tips on doing the front master cylinder seals would be appreciated as i have the kit for that as well , brakes were shocking so put hel braided hoses on and the problem is worse so thinking seals

Thanks in advance