Classic Roadsters used reproduction TD parts for the door latch and striker.
Part 35 in the diagram (item 401-420) is the mounting plate at $7.65 each. It’s hard to tell if it includes just the plate or also the striker. I would call Moss and tell them what you need.
http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexI D=32848&SortOrder=54
Phone is 800-667-7872
Mon-Fri: 6:00am – 7:00pm PST
Sat-Sun: 7:00am – 4:00pm PST
PMOSSBERG39267.0738194444
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)