well if your frame is bent, which it MIGHT be
replacing a cosmetic more or less push tube bumper is NOT going to solve any geometry issue's caused by a bent frame
that bumper has NOTHING to do with steering or handling of the atv
you should be able to drive and ride the atv without it on JUST fine and all things drive line and suspension would work just FINE if you follow
so NO< adding a new bumper isn't going to solve your issue
BUT what a GOOD NEW straight one will do is maybe show you where some things are bent, as bolt hols shouldn;t line up if things are bent, BUT then again, if they bent when things were all bolted together, it could LINE up and still NOT mean frame and parts are straight, as they just MAYBE bent together!
to break and bend that front bumper as it is, that had to have been a HARD impact, it looks to me like your whole atv frame is bent, the headlights are off, and many other parts are not level like from these pic's
you should have done more looking at the time of the accident IMO!
you need to get things looked at by a person better informed than you(not bashing you at all)
as if FRAME is bent, or if tie rods are bent, A arm's, or shock mounts or???
it can all add up into problems on ride .handling and such
I would be looking really hard for any cracks in welds all over this front end if it was me, a good washing and some UP close and personal looking at ALL welds
if you can ADD a video of the front end diving, that would help a lot,a s again, it could be some what normal dipping, or it could be something really OFF< we cannot tell by a pic , as we cannot see what its doing as its doing it
thus, a video MAYBE< or taking it to someone that know;s more than you to help ID the main issue here!
also again, have you gotten the atv up off the ground and tried driving it that way,
(get atv's ALL 4 tires up off ground, put in gear and while YOUR off the atv, give it throttle and then back off and see what happens)
so to see if anything is binding when NO one is atv and throttle is let off
does front end still dive? if so, its a drive line issue, NOT a normal deal!
something is bent worn or broken or all of the above!
a way to help pin point issue's
things you CAN do before you take it some place too?