We sell these GSR intake runner sleeves for the Busso V6 engines, made of silicone, in a 6 piece kit. They have the same internal steps and lips and the same thickness as the original ones, so you can even use the original hose clamps.
They fit all 2.5, 3.0 and 3.2 V6 24V models and the 2.0 V6 TB. Make sure you choose the right diameter. Obviously they also fit other Alfa Romeo models with these engines. They come in black, red and tricolore and we give a 5 YEAR warranty.