Above: This is a head off an ST4/ST4S and Post 2000 spec S4, 748, and S4R motors. Look at the rocker pin cover between the cam covers. If the cover has 4 bolts then you have a non-ST-head desmo, meaning the belts on this page will fit. If you have 5 bolts (one on each corner and one behind the oil line in the bottom center of the cover), then you need the ST4 belts sold HERE
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Bucci Reinforced 4VCam Belts - $70/set
These belts will fit 851-888, 916-996 bikes, and all pre-2001 748/S4 models. These Belts WILL NOT work on the ST4/ST4S or post-2000 748 and S4 models. At half the cost of the OEM belts, these belts are certainly more cost effective. I've used and sold these belts successfully since 2000.
NOTE: Will not fit R variants of the 748