Thanks for the comments. I was looking for just the exhaust pipe, not the silencer, so there's no brackets to worry about only its shape and dimensions. Ebay has some of the RX100 pipes under p/n 36LE46110000 and they do look similar being a sort of a shallow L shape with a loose flange fitting to mount to the engine and open where the silencer attaches.
Parts drawing sketches of both attached.
I should have added that if you click on the drawing, its name will be shown to distinguish between them, although they look the same.