Does anyone know what strings Stanley Sheldon and Boz Burrell used on their fretless basses?

[Matt_on_bass]

Getting a new fretless bass and wanted to know how to get the tones of Peter Frampton's fretless bass player, Stanley Sheldon, and Bad Company's fretless bass player, Boz Burrel

 

[bassbrad]

I keep trying to remember an advert with Boz using RotoSound strings but I might be mistaken.

Looks like Stanley Sheldon is still kicking it and you could ask him on FaceBook.
Stanley Sheldon Site