Oil Return (Drain) Fitting W- Long -10 AN Fits T3 GT37, GT40, GT42, GT45 GTX42 GTX45 Head Studs The main case breather is

The main case breather is -12 and the others are all -8 AN

5L SS 4WD Outback Wagon 2008

the improved engine design from the GC8 to GDB and A models had increased the rib of the outer bore diameter which improved the gas sealing characteristics

Mains feature enlarged

2005 WRX 6MT/AT - 22611AJ892

Oil Return (Drain) Fitting W- Long -10 AN Fits T3 GT37, GT40, GT42, GT45 GTX42 GTX45 Head Studs The main case breather isFits the following: T3, T3 T4, T4 GT journal bearing GT32, GT4088, GT4294, GT4202 GT3788R GT40 GTX40, including GT4088R, GTX4088R, GT4049R GT42 GTX42, including GT4294R (GT42R), GTX4294R, GT4202R (GT42RS), GTX4202R GT45 GTX45, including GT4508R, GTX4502R, GTX4508R