A dispensing device for dispensing fluid from a side-by-side fluid cartridge includes a dispenser body, a first piston adapted to slide within a first fluid chamber of the fluid cartridge, a second piston adapted to slide within a second fluid chamber of the fluid cartridge, and an adapter head moveable between first and second positions for releasably connecting the fluid cartridge to the dispenser body. The first piston and the second piston are coaxially aligned with the first fluid chamber and the second fluid chamber, respectively, when the adapter head is in the first position and also when the adapter head is in the second position. Another dispensing device includes a plate coupled with a dispenser body and movable in an axial direction of a fluid cartridge between a first position for receiving a first cartridge flange having a first flange thickness and a second position for receiving a second cartridge flange having a second flange thickness.