I've taken a careful read of IVA requirements. Today I found out that the IVA manual diligently recites the regulation by the UN ECE, Regulation 48, "Installation of lighting and light-signalling devices on motor vehicles", Revision 6, pages 45-48
http://www.unece.org/fileadmin/DAM/t...egs/r48r6e.pdf
The sticking point seems to be that the side repeaters should be visible 5° from behind, and 5° below the horizontal.
When mounted on the scuttle, neither the horizontal angle is satisfied (due to the 10° angle in the chassis), nor the vertical, due to the rear arch obstructing the view. I'm afraid bike mirrors with indicators are irrelevant, too, as the indicators are not facing to the rear.
Mounting them on the rear arch, as shown by HandyAndy above in this topic might be OK, but it's just on the limit of the distance from the front of the vehicle (<= 2.50 m), and might be 1 or 2 cm over, unless specifically checked. The book-design rollbar is more than 10 cm out of bounds.
Front wings are out (IMO), because the requirements are not met when the wheels are turned to the side.
The remaining options I see (besides the
front edge of the rear arches) are motorcycle stalk indicators mounted on top of the scuttle, facing sideways, or something integrated into the window frame.
I think the best option is to mount them in the scuttle and hope that the tester takes a blind eye on the angles... If not, mount bike stalks on top of scuttle for a re-test and remove after IVA, reverting to scuttle repeaters, which are conveniently there.
The viewing angles requirement seems so pointless in our case. The small repeater, when looking from the 5° rear, 5° below angle, is obscured by a rear arch, carrying a large rear indicator with the 21W bulb.