which end goes first ? well, mostly of cases you make them fit allmost at the same time. At least I fit them with LCA already on K member

now some extra info.

no difference between rear and front... does't affect even being used.

think on a bolt and nut. No matter wich side you tight, nut or bolt head, allways will be on the same direction. Get it reversed, and will still tight the same direction.

the only important thing is keep the left on left and the right on right.

what is very common but not mandatory is keep the PN visible on rear