I would ask if J Carter to measure the distance between the screw holes on the 41 and 42 parts.
Looking at photos of 41 and 42 trucks the headlamp buckets look the same. Maybe someone here can confirm they are indeed the same part. So you should be able to use the 42 parking light parts on the 41 headlamp bucket.
At least you would then be able to use the truck until you find the right parts.
Jeffrey
