Does anybody know where I can get inner fender liners?

Since you gave no info as to what year Z or even if you mean front or rear, I'm assuming you mean front. Look through this thread and it should help you identify what you're looking for. As far as actually finding them? Well that's kind of discussed here too. This is an old thread and they weren't easy to find when it was current. You'll have to read down to about post #11 before we all got on the same page (so to speak).

http://www.classiczcars.com/forums/showthread.php?t=12181&highlight=Fender+liners

I will try thread, fyi it's a 1978 280z drivers side fender liner I need

I haven't seen those in any catalog for years.

You are making reference to item #78 and #80....Correct? See the following url for picture and items that I'm making reference to:

http://www.atlanticz.ca/zclub/techtips/explodedviews/280z/front%20panels%20l26%20l28%20%20fr%20aug%2073.gif

webdawg1

Allow me to properly parse that url for you, webdawg.

http://www.atlanticz.ca/zclub/techtips/explodedviews/280z/front%20panels%20l26%20l28%20%20fr%20aug%2073.gif

Yeah...that url ()

webdawg1

Banzai Motorworks has just yesterday picked up from the manufacturer an excellent reproduction of the rear-most inner fender liner for 260s and early 280s. 

Nissan called them mud-guards if i remember correctly...

According to my 12/79 Nissan Z Car parts film the plastic inner liner is called Protector-Front Fender Rear. The rubber flap is Rubber-Mud Guard. My repros come with the rubber flap (Rubber-Mud Guard) and all of the required correct Nissan fasteners.