The part number for a suspended socket that would suit the 56PA520 -
56C520 & 56SPOK
56C520 
https://www.clipsal.com/products/detail?CatNo=56C520&itemno=56C520-CG&backto=/search?q=56C520&tab-document-1=0
56SPOK
https://www.clipsal.com/products/detail?CatNo=56SPOK&itemno=56SPOK&backto=/search?q=56SPOK&tab-document-1=0