S2415H Power Adapter part number and possibly how to purchase a replacement?

I have misplaced my power adapter while moving and cannot figure out what adapter I need to purchase, either 3rd party or from dell (if they sell them). 

My monitor is the S2415H, but on the back it is listed as S2415Hb. Not sure if there is any difference.

I attempted to chat/email technical support, but the monitor has no service tag and the serial number did not work so I simply cannot contact technical support which is current closed via phone. If anyone who owns the same monitor could help or if dell support can provide the part number it would be appreciated. I would like to order one ASAP as I currently cannot use my PC without it.