u joint for d30 from d18?

hey i just put a d18 back into my jeep, the only problem is the front DS uses tiny u joints, and the dana30 takes a much bigger one, where can i buy an "adapter" u joint? anyone know the techinal need for what i need? like a 1310 u joint or whatever

 

do i have to change out the flange on the d30? will one from a d27/d25 swap right over or are the spline counts different?

 

I had my driveshaft changed so it now has the big u-joint on the front end and small on the rear. Works well. I also had the length changed so it really fits perfect now.

 

i think i figured it out, i just put the yoke from a dana 20 on my dana18, I have a driveshaft with big u joints from a later cj, now i just need to get it shortend like 2"

what do most places charge to get a driveshaft shortened and balanced?