"Ball Head" bolts for tonneau cover fixture

[Cyruskint]

Does anyone know of a supplier of the longer variety which allow you to put the tonneau cover on whilst using the wind deflector (Facelift with roll hoops)?
These have a land or margin between the ball head and the spanner flats - I believe the slots in the wind deflector go over the land/margin on the bolt, thereby securing it.
Thanks.

 

[Nodzed]

@Jjim should be able to help, he will pop on sometime now he is tagged

 

[Jjim]

I got mine from @Synclare

He might have another set.