If aftermarket, pretty much anything 'universal mount' that you pick up at a parts store will do the job. (better hope you got the right screws though, 'cause they for darn sure won't come with the kit)
If your '85 Spider is a Graduate edition, then those are OEM for that model. The '85 Graduate is the only series 3 Spider that came with those mirrors. (Other post-1982 Spiders came with one of the three versions of remote mirrors.) The chrome mirrors were originally OEM on late series 2 Spiders (which ended in 1982), but they will fit the doors of any late series Spider.
Originally I had the big black plastic ones but I thought they were ugly and so I replaced them with the chrome ones. But I have to add that the plastic frame which goes along the chrome mirror outside is going to break after about 5 years because it is just not the best quality and so far I have heard there are non that don`t have these "symptoms".
'84 manufacture - '85 MY Spider Graduate 
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