This reflector has a tapered back to fit the curve of the Isetta body just below the rear light unit. It comes with a polished stainless steel washer. Fitted to early cars only pre 1960 which used the small Lucas L488 rear light have a look at Part No L488 you may also need the washer for these Part No 097/7. Note On some cars just like the Lucas RER5 rubber base it may not fit exactly to the shape of the body this is normal like the original Lucas part which was used on several types of car including Austin A35, so we believe it was a compromise of shape to fit and suggest the careful use of Black silicon sealant to fill the small gap This item was manufactured on Tooling commisioned by the Isetta Owners club ensuring once again even small parts become available