This is a major service kit for F355 models:

4 x 163987 CAM SEAL
4 x 158349 CAM O-RING (GREEN)
2 x 140787 END PLATE GASKET
8 x 149554 SPARK PLUG O-RING
2 x 127816 FUEL BLOCK O-RING
1 x 197654 OIL FILTER
2 x 164417 WATER PUMP HOSE/ANGLE
1 x 10257060 WASHER/COPPER
1 x 10261860 COPPER CRUSH WASHER
8 x PMR7A NGK SPARK PLUG
1 x 176156 DX VALVE COVER GASKET
1 x 176157 SX VALVE COVER GASKET
1 x 163620 SX PLUG COVER GASKET
1 x 163621 DX PLUG COVER GASKET
2 x 184986 TIMING BELT
1 x 117792 FUEL FILTER ** SEE OPTIONS **
2 x 10280060 WASHER/COPPER D. 14-20X1.5
2 x 151562 AIR FILTER
1 x 199832 POWER STEERING BELT
1 x 199830 AC BELT/ALT BELT
2 x PT355 355 CAM BELT PULLEY (MFG. BY HILL ENGINEERING)
2 x 117275 CAM O-RING
4 x 114808 CAM BOLT O-RING
1 x 199833 ALTERNATOR BELT
1 x 64612000 WATERPUMP S-HOSE (We include this very expensive hose in our major service kit, because we feel any job worth doing is worth doing right. This WP hose should be replaced with each major service. Shopping around? Ask our competitors if they include this hose in their kits)

NOTE:   If you have an F355 F1 with BOSCH ABS, you will likely also need 1 x 174509 O-RING which is not included in this kit.  174509 is located on the LH cylinder head behind the ABS vaccum pump body (Item 57 here in this diagram)

** BEWARE ** Many eBay sellers claim to have a complete 30k major service kit for a cheaper price... but ask them where the tensioner bearings are! They don't offer the bearings in their "low low" price. The bearings are without question one of the most critical Ferrari engine parts in the 30K service process.