Your suggestion of the TI til302 is a good one. The dimensions & pinout match the ones in the DC504. The chips are only 1.4 inches thick, which is what I need.
But, this part is obsolete. I did find some on Ebay but the seller wants $10 each. I though that was a bit pricey.
At a higher sn, Tek changed the displays to MAN3620 but those are obsolete too.