I made a list of all the SDX sizes I own already converted for the 2box. So you can calculate the SD card size and number you need.
Allaire 585 MB
Avatar 1.25 GB
Custom & Vintage 1.65 GB
Evil Drums 6.85 GB
Indiependent 3.2 GB
Metal Foundry 4.08 GB
Metal Machinery 2.5 GB
Music City 885.5 MB
New York 2 Hit Factory 569 MB
New York 3 1.87 GB
Progressive Foundry 5.68 GB
Rock Warehouse 2.32 GB
Roots Sticks 2.14 GB
SD3
Rock Foundry 6.2 GB
Decades 3.72 GB
Death & Darkness 10.1 GB
Rooms of Hansa 6.09 GB
Core SD3 8.18 GB