The Crucifixion; The Last Judgment — the diptych
Sizes
One object, one accession: the Met holds the diptych as 33.92ab — object name 'Painting, diptych', both panels 56.5 × 19.7 cm — and it is sold whole. Two sheets, one edition, $323 — the printed images hang level within 0%.
The Met keeps one record for both panels, and calls the object a diptych: accession 33.92ab, each panel 56.5 by 19.7 cm, the two identical in size. They were made to be read across the join. The Crucifixion is given as an eyewitness would have it, the event set against a distant landscape; the Last Judgment answers it hieratically, built in three tiers with the figures scaled to their importance rather than their distance. One panel is what was paid; the other is what it purchased. Sold apart they are two pictures. Hung together they are the sentence van Eyck actually wrote.
The Met's tombstone gives one measurement for both — 'Each 22 1/4 x 7 2/3 in. (56.5 x 19.7 cm)' — so the panels are level on the object itself, and because both are height-limited on every sheet the printed images are level too, at any shared size. Order follows the museum's own title and the accession letters: the Crucifixion is 33.92a, the Last Judgment 33.92b.
Sources
Printed on demand as one edition. The whole image is printed on every sheet — never cropped to fit — so each panel carries an archival margin.