Awesome, thanks for the info!http://www.epcoshiftknobs.com/
I dealt with Jessica. 508-533-2741. Just a note for what I did...Both knobs are 2" round, gloss finish.
I have the LT85 transmission. The shift threads where the knob screws on are 1/2"-20.
My trans box (transfer case LT230) Diff Lock knob is M10x1.5
As usual, somethings are metric and some are standard, keeps it interesting.
They took a few weeks to get them to me since the Diff Lock is a custom job but well worth it to me. Outstanding quality. Paid about $100 for both of them. Maybe you'll get lucky and since they just did the Diff Lock design for me, they should still have the design and you'll get a break on price since it is a custom order. My invoice number was 41271 if that helps.
Let me know how it goes