LWB to SWB drive shaft question

[Jayschevy]

I have a 71 C10 with a 350 engine and 350 tranny. I'm thinking about converting my long bed to a short bed truck. I've looked at few threads but could never get a solid answer about the front drive shaft. After shortening the frame what options are there for the drive shaft from the transmission to the carrier bearing? Do you just have the old driveshaft shortened 12" or is there another driveshaft that'll work with our truck. I want to keep my 2 piece drive shaft.
Any help would be appreciated.