This problematic unit has finally been reproduced by Lucas with Modern Solid State Digital Electrics. It is a very unique style of relay in which the unit enables existing stop lights to be used as indicators as it overrides the stop light function not the side when turning, the other side stays lit. Also there is a little more magic on the inside of this unit, can be used in both positive or negative ground applications. This style of relay was used on the Austin Healey BN1 to BJ8, Jaguar XK120, XK140, XK150, MG TD, TF, MGA.