Been checking on the pictures in the textbooks and they look like Carello lamps to me. Not the usual Cibie most folks used at the time, but they often have the covers on in the daytime so you can't see them.
We have Carellos on TUD682T, these were on it when it was used by the factory in 1979. Apparantly they fitted above the bumper better due to their shape.
www.triumphtrs.co.uk THE Coca Cola car
The C+C Conversions rally car JDG 941V
TR7 Sprint SJW 530S on the road for the 1st time since 1984
TR7 Sprint SJW 539S