Hi @thequacker,
Don't know if the ''height'' specified in the following is the total height or just the display:
[https://support.apple.com/en-bn/112597|27" Thunderbolt display] height = 19.35 inches (49.1 cm)
[https://support.apple.com/en-us/112569|A1312 iMac display] height = 20.4 inches (51.7 cm)