Sorry if this is a stupid question but is the Z400 filter an external screw on??
If it is you might check Scotts performance web site
I got one of their reuseable oil filters for my Raptor & it's a great piece!!

Here's a pic of the Scotts filter
They didn't have one listed for the Raptor but I called & they did have one.
I'm very happy with the filter, It costs $109 But It's the last filter I'll ever buy & if they have one for the Z400 you'll never have to chase one down again.

 

no it's not a screw on, it's a cartridge type filter. scott does have a reusable cartridge filter for the drz motor which should be the same as the ltz.

 

Go to any shop that deals with Tucker Rocky. Give them thoes numbers and they can get them. I just sold out Sat. I got to order a another Dozen monday.