Overview of the currently available spectral data spanning the MIRI spectral range for P- and D-type MBAs, Jupiter trojans, centaurs/TNOs, and comets. Our centaur observations provide a direct link between Kuiper belt objects and primitive populations of the inner Solar System as predicted by Solar System formation models. The IDP spectrum was retrieved from Brunetto et al. (2011), the Jupiter trojan spectra from Martin & Emery (2023), the main belt spectra from Marchis et al. (2012), and the comet coma spectra from Crovisier et al. (1997); Lisse et al. (2007); Kelley et al. (2017).