Looking for REAR OEM Spats

Fairly unlikely you'll be able to get a set of rears. I ended up buying a brand new set through jd-carparts. They're NLA in most parts of the world, but they managed to source a new set in Japan.

https://jp-carparts.com/

Whilst they're not listed in their website, if you submit a part-request search, they may be able to provide a set. Use F3830-30P25 as the part number which is the full kit. I think the whole lot was around £120-£130 from memory, so not expensive. Landed you're looking around £200.