I'm typically just a lurker on this forum but I have an option for you that works.
The FG switched to the quick fill tank and the FireHammer originals are discontinued. I'm not sure if FG's new tank will fit. I ordered a new tank from Germany and it fits just right. It's for the Carson Attack.
http://rc-car-online-shop.de/shop/e...arson-reely-1-5-and-1-6-scale-2wd-1-pce-.html
They are great to deal with for all of my FireHammer parts. I just made an order today for some more gears. Also you can ask them what fits before you buy. They always answer pretty quick but you have to wait on the time zones.