My experience with ScootRS parts has been okay overall. Their expansion chamber fit fine and was a good value for the dollar although I have since replaced it with a JL. The rack/carrier I purchased was also fine but is showing a bit of rust after three years of year-round riding (plenty of rain).
In our current "global economy," we frequently do not know the origin of the parts we are buying. I have purchased presumably high quality Italian and German parts only to get them into the garage and learn they are junk. I will never assume a part is good or bad based simply on the company that sells it.
You folks in the U.K. are blessed with a high concentration of Lambretta shops and parts manufacturers. My opinion is to support your local businesses whenever possible. Call around--somebody over there may have a set of these panels for you to see firsthand.
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I took the chance and bought a pair. Shipping costs as much as the panels, instantly doubling the price.
The stamped panels look okay except for two issues.
1 They are too short
2 They are not drilled for badges or flashes

Aside from the appearance, the shortness is a problem when mounting them onto the scooter. The latches will not reach the spring. Fortunately, I had an old spare so I bent it up so the latches could reach it.
The gap is bigger than it appears in the photo. (TWSS)
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DaveInPortland, AKA: th' Cap'n