I checked these loaders:
Waninkoko, Brisma, Ultimate: they use just flat covers, they are made for 2d 160x225 covers but works also with 160x224
GX: discart 160x160, 3d 176x248, 2d 160x224
Config: discart 160x160, 3d 176x248, 2d 160x225 or 160x224 (made for 160x225, works well with 160x224)
CoverFloader: discart 160x160, fullcovers 512x340, 2d 160x225 or 160x224
WiiFlow: 2d 160x225 or 160x224, it did not download fullcovers and discarts