Hi Ben got your e-mail and I'll copy this post to it.
First off no bars last for ever - they are disposable like a chain.... same as a chainsaw file (ob relatively you go through loads more files relative to bars) you can use a bar for a long long time but over time the bar groove gets widened by the passage of chain down it.
How long does a bar last? - difficult to answer indeed as depends on a multitude of factors - use, chain and chainsaw maintenance, has the chain come off the bar, burred the drive links, is it milling, etc the list goes on.
The oregon selector guide gives a K095 mount - which is good as it is the main mid range Husky mount.
Rather than go into what the pitch and guage is etc have a look here Chain | bar | sprocket identification and try and take the time to get to know what all the numbers mean... don't worry so much about the Makita numbers on the bar... most bars get replaced with oregon, (or can be cannon or sugihara...) I expect oregon probably make the Makita bars anyway.
So for you saw you can 'pretend' on the selector guide here to have a Husqvarna 160 - 18" and it will give you the results and these bars will fit your saw.
.375 is used on the website instead of 3/8 the / sign causes problems.... but 3 divided by 8 is .375...
Get a new chain with a new bar - micro chisel is prob best for you use. If on my site use Husqvarna 160 in the chain selector.
Sign up first as you get 10% discount being an arbtalker - e-mail me when you have signed up for me to set this. Also check your sprocket - is it a rim or spur? Hopefully a rim so you can just change this as I expect it's worn... if a spur then that will be harder as oregon don't seem to list one! Sprocket care
Rob