JBL 2370 Horns -
90 x 40 degree nominal dispersion
1" throat entry
uniform on and off horizontal axis response from 630Hz to 16kHz
17.5" wide x 6.8" tall, mounts in 15.75" x 5.3" hole
Used but in mint condition. Full manufacturer's spec sheets in pdf format can be found on the Parts Express website below. The 2370 horns are still in production, typical retail price is around $250 for a single horn.
$80 each, $150 per pair, $275 for all four.