For the x32 slot: RSC-R1UW-2E16. It's 2x16. Together with the x8 slot, this MB gives you the full 40 pcie lanes on E5 v3/v4.
This is SM's proprietary UP WIO form factor, which is 8.15" x 13.05" and meant for the following 1u and 2u chassis (certified):
1U Chassis: SC815TQ, SC113TQ, SC116AC, SC514 and SC116TQ.
2U Chassis: SC213A, SC826BA, SC825TQ.
Of course you can put them in any case that can accommodate the MB's size [for example the cases that the X10SLH-LN6TF are sold in or the 1U Hyve Zeus E5-v1/v2 and E5-v3/4 chassis (all three have been previously posted in great deals)]. However, the issue will be punching out for pcie brackets if they don't accommodate all 3 full height slots.
Again, this is $60 using OBO: