Your box should be a C52
Silvertop 20V's came out with either a C52 (early model) or C56 (later model with better 3rd and 4th gear ratios.) Probably also got the "equal length driveshafts" = better. These are all drop-in fit to your car.
The 4AGZE's came with E series (E52, E58 I think) which are heavier and stronger with stronger shafts. You can fit this box to your GTi but will need different mount I think.
THe Blacktops also came out with the C160 (6 speed) box which is also a drop in fit. Even nicer ratios here. The blacktop and GZE boxes are more likely to come in the LSD option.
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