Lee,
The “buffalo slimlight” will not look correct when mounted. They appear to be on a post, which will sit them up on the fender. The correct style have a flat bottom and mount flush with the fender top.
If you don’t want to go the pricey Moss Motors route, I suggest you wait it out. A pair will turn up on ebay eventually,
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)