1978 olds cutlass, 260 V8, with a factory T-5 manual transmission. Kinda wished I would have kept that car for the uniqueness of it, but research showed the trans was to weak to justify doing anything with it. Didn't care for the single headlights anyway.
The earliest GM vehicle to use a T5 was an s10 starting in 82. The Mustangs started using them in 79. If your Cutlass had one it didn't come from the factory