being a ZR wouldn't it be an ST204, as for installing em i'd leave it to the professionals, by the time you pay for shipping to aus and possible duties it may be a bit more than 300 pounds.
The price from a Toyota dealer was $1600 each bag $700 for a module plus fitting which is well over $4000 when you have finished and the cost of shipping is 75 pounds not sure about duty but i understand that if applicable it will be 25% that still make is less than $1200 australian. That saves you a fair bit for installation! Thanks for correcting me but yes it is a ST204R and thank you for your advice