The LBTEK Fixed Compact Platform Mounts are designed for mounting beamsplitter cubes or right-angle prisms. The PCMS5, PCMS10, and PCMS05 feature a flexure clamping mechanism, suitable for mounting optical components with side lengths of 5 mm, 10 mm, or 12.7 mm (12.5 mm), respectively. The PCMS20, PCMS1, and PCMS2 are designed for mounting optical components with side lengths of 20 mm, 25.4 mm (25.0 mm), and 50.8 mm (50.0 mm), respectively, featuring a side-mounted clamping mechanism that utilizes magnets and alignment pins for easy opening and alignment. Both clamping mechanisms can be adjusted using a 2.0 mm hex key. Additionally, the PCMS20, PCMS05, PCMS1, and PCMS2 are equipped with M4 threaded holes, allowing direct compatibility with posts featuring M4 top holes. The PCMS5 and PCMS10 have M3 threaded holes and can be mounted to posts with M4 top holes using the adapter TAS3-M3M4. The PCMS1 and PCMS2 each feature two M4 and M6 countersunk holes, enabling mounting onto breadboards or other flat devices. Specifically, the PCMS2 is directly compatible with our standard breadboard, while the PCMS1 can be mounted onto flat devices with M4 threaded holes or onto a standard breadboard using the TAS1-M4M6 threaded adapter.