I’ve tried to find original TM plates but had no luck.
The rolled edge is different in the repros to the original and the originals had a range of mounting holes in them. Some line up with the side plate mounting tabs on early 250’s and 400’s (73 and earlier)
The originals are a harder plastic but still flex
If I can get an original I’ll make a fibreglass mould and make up some for myself at least