Air intake maifold cover wanted

Asking for a French friend with a late S1 (1.5 I guess) 1968 2+2 jag.

He’s looking for the small cover on a dual Stromberg carbs air intake manifold as per the photo. This seals off the duct that connected to the crossover duct on earlier models.

I’m thinking that anyone who has done the conversion from Strombergs to SUs might have this spare?

Any help appreciated.
Chris