You can buy the connectors from toyota, there's also an ebay seller that has Denso injector plugs and pins, they're not that cheap though at $8ea..
http://cgi.ebay.com.au/Fuel-injector...3286.m20.l1116
You'll probably find that a lot of other toyota's share the same style of plugs so a trip to the wreckers should be able to provide the bits you need.
Getting new crimp terminals to suit the TPS, coolant Temp sensor, Crank & Cam sensors is a bit more challenging though...
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