Do you know exactly which gearbox it is? It should be a H50F or H51F or if its reallyfrom a 105 series it will be a R151f.
Also do you know which gearbox you have now?It might be a R140?
Its on the aluminium tag on the firewall.
The 1PZ may have some issues with its 2 piece flywheel.All these other 5sp come off one piece jobs
Someone else on this site says his 1PZ has a 5 speed H55f so it maybe feasable.
This is not something reguarly done on this forum