I think the 85mph one is “S433/L or S433/1/L” depending on whether it has a trip or not.
120mph is “S608/3”
I have had all these fitted to various Scotts with out-rigger drives.
My present one on my Brum is a refurbished 120mph (that’s optimism for you!) but it doesn’t have a number on the dial.
It should be possible to buy a new correct rim and shell or buy a second hand shell or duff speedo at an auto jumble and use the parts from that.