Based on this product's specifications, here are some alternatives and similar models
Photoelectric Fork Sensor Panasonic PM-R65-P, R-Type, light-on/dark-on, 5–24 V DC
Summary description:
Panasonic PM-R65-P is an R-type fork photoelectric sensor (light-on and dark-on) designed for object detection in automation and packaging. Operating on 5–24 V DC, the single-piece sensor provides precise through-beam detection within a fork-style housing, suitable for counting, presence control, edge detection and small-part positioning in industrial lines.