looks like an input shaft bearing-It would go into the back of the engine. I would recomend replacing this also...mine was a pitmfa to get out in the mustang...

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1999 Silver GTP~HP Tuners~XP cam~ZZP FS Intercooler~#4 FMHE~ZZP 78mm Billet Throttlebody~LQ4 MAF~Lucas 42.5's~ZZP SS Headers~2.8 MPS~PRJ fuel logs~Ported & Polished S/C~TDCRacing FWI ~Built Tranny-3.29's-7/8's chain-Intense forged Input Shaft~
12.71 @ 107 / 1.9 60' / .401 r/t/ Lot's of excuses

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