one piece shaft

['68 longbed]

just a goofy "want" here but I'd kinda' like to get rid of the two peice drive shaft.

is there a one peice shaft that i can rob off another vehicle that will work with the three speed?

I'm trying to set up to swap motors this weekend and perhaps get a 200r that i have access too, is there a drive shaft that I can rob off another vehicle that will work with that set up?

trying to stay away from cutting a shaft down, or leingthening one. since it makes for a logistic pain right now.

thank you all again for your help. you have saved me a great deal of screwups!