I'm sorry, I don't have an answer.
I reused my starter cable (that had just been replaced because of my ongoing starter woes)
3/8" seems kind of wide for 10Ga.
Again, I used the eylet pigtail that came with the starter.
It had a yellow marine shrink insulated butt splice already attached.
The only cables I ended up making were alternator to fuse and fuse to lug.
I got the solder pellet lugs and red shrink tube from RJM.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.