Those LED displays date back to the 1970's, or maybe even a bit earlier.
The 54 used HP-5082 series LEDs for all counter sections... these 7 section
LED displays were .43" (10.92mm) and common cathode, with right hand
decimal points.
The correct LED for the green display is a HP 5082-7671. You could
substitute a red display--HP 5082-7651, or a yellow display, HP 5082-7661.
The red displays are extremely common and show up on eBay. The green and
yellow displays are tad more uncommon, but this should still be a 1 to 5
dollar part on the surplus market since zillions were made.
regards
Pete k1zjh
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