There was discussion on the SW cover in IMA4W review thread. Dimensions were listed. Stock cover is shallow, L6 fits but too high IMO. You can light under the stock SW cover, it is translucent. Review: Sofirn C8F XPL (Pic Heavy)
TPad has an XM size board and Richard sells them. I can’t say it will work in the C8F reflector but it is the same LED circular footprint (Ledil Optic fitment) as the XP32 dale used. TPAD XM / XHP50 32mm Copper MCPCB