How about a straightened wire coat hangar? Can also be reshaped when you need to break in to the tin top laugh2

Perhaps Andy could send you a photo of the stainless front retainers as supplied with the HoE kit (and very similar ones fitted to RTA).

Cheers,

Graham (G4FUJ)

Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW