HUGE differences betwen 280 and 290 cars when u know what to look for body is different yet look sthe same
tub is same rear engine frame to rool hoop is different front anti rollbar and position on car completly is different position
different brakes
maybe different uprights i have not been close enough recently to a 280 to see
gearbox is dg300 not fg400
wheels more than likely larger width on rear
The car at the race in argemntina was lola 280 not 290 car hu1
Unless factory records can tell us more!!!