Converting one chassis to another is not supported as there is lot of differences between each chassis. 
We have an R6515 that was purchased with the 4 x 3.5" chassis and backplane. Is it possible to swap out the backplane and drive bays in the chassis so that we can use 10 x 2.5" NVMe drives instead? If so, where can I find a list of part numbers that we'd need to order? Thanks,Rob
R6515 - 4 x 3.5" to 10 x 2.5" conversion