How many O-rings do I need per injector?

[Road-Rocket]

I have a boost leak on all 4 injectors. I purchased the kit below and I was wondering if that is all I need to replace the injector seals. I read somewhere that you need 2 O-rings per injector, one on each end of the injector plus insulators. Do I need to buy another 4 O-rings? And if so, are they the same size as the orange ones below? I'm still on the stock injectors. Any info will be greatly appreciated. Thanks.

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[spoolup]

you have a oring on top and a insulator on the bottom, its the insulator that leaks. If your oring leaks, you will have gas all over your engine by now. mitsu sells them all (4 o-rings/ 4 insulators) for about $25.00.

Oops pic took too long to load, but yeah that all you need, be sure to lube the rings before trying to seat them (spit works good). But what you ahve is what you need.