What DVD drive will work with i-series

[wmsontx]

Hello everyone, been visiting this site for the last year and finding info here to be very valuable. I’m trying to figure out what type of DVD drive I need for my i-series 1400 2621-420. I’ve searched e-bay and not having very good luck as I don’t know what type I’m needing. I see slim-drive ultra bay ect.. have searched IBM drives with not much coming up for what I’m putting in as search criteria (1400). My question is dose anyone know what other models will work with this it doesn’t have to be IBM brand?