James, if it matters to you, part number A-13705-AR (second one on the first page Ringo linked to) is similar to the map light on an original MG TC.
The original TD had no map light. So you are free to do whatever you want!
PMOSSBERG40072.9671759259
Paul Mossberg
Former Owner of a 1981 Classic Roadsters Ltd. Duchess (VW)
2005 Intermeccanica Roadster
If you own a TDr and are not in the Registry, please go to https://tdreplica.com/forums/topic/mg-td-replica-registry/ and register (you need to copy and paste the link)