Why not make a top mount tank? There are a few guys that run them on here, they are made of aluminum and replaces the stock airbox up top, and eliminates the pos fuel pump and vacuum lines. This stock setup was a big downfall for the Z if you ask me.
The other idea is to get a stock one off ebay. The Z tank seems a dime a dozen, from what I have seen in the past a guy could have picked one up for about 40 dollars. Surely one of the sellers would ship to Canada..
THE 80's RAGE! Currently owns:
81, 85 Yamaha Tri Moto 125
83 Yamaha Tri Moto 200 x2
82,83 Yamaha Tri Moto 175 project
85 Yamaha Tri Z 250
84 Kawasaki Tecate 250
84 Honda ATC 70
85 Honda ATC 350X
84 Honda ATC 250R
(2) 84 Honda ATC 200x
82, 83 Honda ATC 185s
81 ATC 200
Lots of other parts and bikes