55.2-59 1956 3100 LS swap radiator issue

[Mike_The_Grad]

Hey everyone, been helping out a buddy with his 56 truck ls swap. We bought ls swap radiator on ebay. It showed up yesterday and when I went to test fit it I seen that the radiator has the drivers side mounting bracket in the correct location which is towards the front of the truck. But the passengerside mounting bracket is towards the rear of the truck. Or closer to the engine side of thee radiator. What gives? Been looking at pictures all morning trying to see if there's some funky core support stuff ii don't know about. But I would think both mounting brackets should be on the same plane of the radiator. Meaning both on the forward leading edge or both on the rear edge of the radiator. Any insight? Thanks