pretty sure you can't just buy them...............

Propane Injection Kit
Finally an alternative to troublesome carburetors and complicated fuel injection systems! These kits are designed to withstand the abuse of severe weather and extreme rock-crawling abuse.
Your answer to Sammy carb problems. The stock carb is too small to make good power and even though the aftermarket carbs make more power, there have flat spots, poor low-end drivability, and they do not take the angles. This kit is the best of both worlds: it has the power of an aftermarket carb and excellent low-end power. Depending on how much power you need to make, this could eliminate the need to swap the E.F.I. 16 valve, which is a major project and huge expense. Kit comes with all necessary parts needed for the install and one tank bracket. All you need is a propane tank.

Propane is a by-product of the refining process of natural gas and crude oil. About 3% of a barrel of oil becomes propane. Propane boils at -44 degrees Fahrenheit; when it is vaporized, it becomes a gas again. Because it vaporizes at such a low temperature, it mixes easily with air. Therefore, it doesn't require a high temperature (over 400 degrees Fahrenheit for gasoline) for it to atomize. This improves cold starts, emissions, and driveability. Propane is a stable fuel; it doesn't go bad if you don't use it!
Since propane has such a low carbon content, motor oil never gets dirty which increases engine life. The oil does still need to be changed, though not as often. Spark plug life is dramatically extended. Also, you cannot "flood" a propane engine. When a gasoline engine "floods," raw fuel enters the cylinders, washing past the rings and into the oil, also wetting the plugs. Propane carburetion automatically compensates for altitude and climate changes, saving carb re-jetting and computer re-learn.
Since propane is under pressure, there are no fuel pumps, no float bowl, or needle and seat. Another plus is the high octane rating of propane between 100 and 110. This means that if you are turbo-charging or supercharging, it is the ideal fuel.
The propane system is sealed to the elements so that even complete submersion will not allow water into the fuel system.
Propane is available throughout the world. It is all the same fuel and the fittings are standardized. Your local propane dealer will usually cut you a break when buying motor fuel.

Some more benifits include: Burns clean, Requires no maintenance, Is easy to install, Is very safe, Is affordable, No wiring except the on/off solenoid, Propane is not harmful to soil or water, Comes with a one year warranty, Full tech support, Runs on any angle, No electronics or fuel pumps, Removable tanks for easy refilling, Very tolerant to stalling (will not stall unless you stall it), Restarts instantly after a stall, Complete kits, except the tank itself. (about $140-$155 for a new forklift cylinder).


Kit
Price: US$690.00


Extra Tank Bracket
Price: US$85.00

LPG is propane....... with a small amount of butane added.

http://www.lpgaustralia.com.au/index.ph ... &Itemid=53

you arent supposed to work on or install gas on a registered car unless you have a ticket for it, buying parts is the same, Customs might knock that kit on the head and getting bottles might be hard

works good though, gas is a great fuel.