Rear rack question

I am repairing a rear rack for Superhooper. Doe anyone recognise the style?

I am wondering if the bottom rail, where it fixes on the frame behind the seat, is deliberately curved or whether it should be straight. See below

Any info would be welcome (I bet Dimitrious has four of these, inc two NOS
)

I am wondering if the bottom rail, where it fixes on the frame behind the seat, is deliberately curved or whether it should be straight. See below

Any info would be welcome (I bet Dimitrious has four of these, inc two NOS
