NEED WHEEL BEARINGS FOR YOUR STROLLER?. X2 REAR BEARINGS ((MODELS 1, 2, 3, 4, 5 & 6): ITEM NUMBER - 38244460776. X4 FRONT BEARINGS (MODELS 1, 2, 3 & 2016): ITEM NUMBER - 382805685563. X2 FRONT BEARINGS (MODELS 1, 2, 3 & 2016): ITEM NUMBER – 382463548464. ).