I've heard of gettas too and this is how I get it. Any GTI part should go onto a golf TDI without a problem. Except the brakes, axles, some suspension parts from some years? The bumpers are direct bolt on.
Any golf body can have a jetta front but you can't just swap bumpers, you also have to change the fenders and hood and headlights. Same wiht jetta body putting on golf parts in the getta.