The rhf3/4 hybrid isn't off another car, it is 2 turbo's put together.
As you have the 3 cylinder engine which I assume would be the EF-RL you should be able to do the corsa hybrid yourself as it only works with the EF-RL which has the VQ29 turbo, not the VQ29 from the JB-JL. Read skattrd's thread here: kkitp.com/3/index.php/forum3?view=topic&...imitstart=0&start=30 it would be the cheapest way to get a functioning turbo. However, that hybrid won't really give you much of a performance gain if that's what you're after.
its got to be the ihi rhf3 vibg turbo of the 1.5 Isuzu engine that was fitted to the first 1.5 corsas before GM fitted there own engine , its the only turbo that will fit. but you will have remove the turbine shaft (exhaust comp wheel is part of it) out the standard turbo and swap it for the shaft in the corsa turbo and use the corsa inlet turbine and use the standard housing and bolts it al together and it will fit, you will also need the corsa water feed block that mounts to the turbo as they are slightly different and the standard turbo 1 wont fit