check http://www.jaycar.com.au . theyve got tweeters galore you can buy and add them to your existing system! heres 1 description of the tweeters i just looked at on there : CAT. NO. CS2210 Super Car Tweeters - Pair QTY 1+ $45.00 2+ $40.45 4+ $35.95 Top quality tweeters, made by a specialist manufacturer. Mount these tweeters in the front, either on the doors, or near the dash to give sound systems a good staging effect. They can simply be added to an existing system with a 3.3uF capacitor connected in series. They will then work from about 10kHz upwards. They can be crossed over lower but power handling is affected. They have an extremely flat response and are extremely versatile in their mounting arrangement. There are two bases - one flat and one angled at 45°. Simply mount one of the bases and clip in the tweeter in one of three different angles. Ideal for mounting on doors, panels, near dash, on rear parcel shelf or virtually anywhere. Beware of low priced Chinese made tweeters that may look similar. Specifications:- System Power: 40WRMS (with 3.3uF x'over cap)- Freq Response: 3kHz-20kHz - Sensitivity: 93dB 1W/1M- Optimum X'over Point: 10kHz - Magnet: Neodymium- Tweeter Direction: 360° - Dimensions 50mm dia, 30mm height at rear - flat base. need a crossover too? CAT. NO. CX2640 Super Car Tweeter Crossover QTY 1+ $11.95 2+ $10.70 4+ $9.50 These crossovers are designed for Super Car Tweeters or most super tweeters. It consists of a 3.3uF capacitor and a 0.10mH inductor mounted in a small plastic case with leads attached. - Crossover point 10Khz 12dB/oct - Case size 44(L) x 25(W) x 21(H)mm.