The Ys should work fine. If you're trying to "make" the screws fit duct tape works pretty well for a temporary fix. It strips off easily and evenly, but after a while it does loosen. So be looking for right sized screws before the vibrations start.

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Athlon XP 1900+
Alpha Pal8045
Abit KR7A RAID
2x256Mb PC2100 /w ECC
Maxtor plus 60gb ATA-133
Seagate Barracuda 40Gb ATA-100
Cardex GeForce3
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Toshiba DVD 16X/48X
Enermax case /w 430W EG465P-VE