need new headlight lenses

[jabstick420]

there are two options 176mm and 165mm. roughly 7" and 6.5".

are they both alright to use. or should I be using one or the other.

not sure which is the drop in replacement.

got a crack on my h4 conversion lenses and want to swap out both.

these are hella vision h4 kits I'm looking at.

thx as always