The Universal Standard 15-Range Rectify Series drop-in speaker systems come in a wide selection of heights & lengths in 15mm widths. You can use these for applications that I do not offer a specific design for. More than just a box, the enclosures feature Diapasonic Tuning™, which allows the lower frequencies to accurately develop and resonate, clears the midrange of excess resonance and tunes the upper-mid/high response.
 
The speakers come fully assembled and tested.
 
Dimensions are:
UFIT-5930-RC1: 9mmH x 15mmW x 30mmL
UFIT-5935-RC1: 9mmH x 15mmW x 35mmL
UFIT-5940-RC1: 9mmH x 15mmW x 40mmL
UFIT-5950-RC1: 9mmH x 15mmW x 50mmL
UFIT-5230-RC1: 12mmH x 15mmW x 30mmL
UFIT-5235-RC1: 12mmH x 15mmW x 35mmL
UFIT-5240-RC1: 12mmH x 15mmW x 40mmL
UFIT-5250-RC1: 12mmH x 15mmW x 50mmL
UFIT-5530-RC1: 15mmH x 15mmW x 30mmL
UFIT-5535-RC1: 15mmH x 15mmW x 35mmL
UFIT-5540-RC1: 15mmH x 15mmW x 40mmL
UFIT-5550-RC1: 15mmH x 15mmW x 50mmL
UFIT-5830-RC1: 18mmH x 15mmW x 30mmL
UFIT-5835-RC1: 18mmH x 15mmW x 35mmL
UFIT-5840-RC1: 18mmH x 15mmW x 40mmL
UFIT-5850-RC1: 18mmH x 15mmW x 50mmL