Hi Shvegel,
Not still stuck on boat, I trust. I've been working on and off for some time on a/c, haven't brought it all together yet so am not the definitive word on anything. That said, I looked at the Spals after reading of them here, found likely suspects on pps. 48 and 66 of their online catalog as it was a year or so ago. [Actually, wife and my families are in same area as Spal USA, so I thought I'd mosey on over one fine day; no dice: no "city desk" and no visitors. Odd, being there at the only Spal facility this side of Italy and having no way to interface with them.] Spal products are only accessible through specialty retailers, and in Iowa those guys are all geared toward dirt track racing and I just got nowhere.
Dunno what Spal outlets our posters found --and wish I did: try high-end auto aftermarketers? -- but in the course of cobbling a/c systems many paths lead to Vintage Air, pretty much the 800 # gorilla in that room. Poking around their operation led to Ryan in Engineering [extension 134]. Based on a discussion of cabin size and measurements of original fans -- especially in the area of interface with the evaporator shroud assembly -- he recommended their P/N 401-000-VUR, then priced at $124. Probably not the performer that the Spal would be yet likely more fan than necessary or originally supplied - - and less expensive than the Spal. I ordered one but that project has been overshadowed by so many higher priorities that it may not get done in time for even the next warm season.
Best luck with your efforts, and let us know how it goes; solid information on this would be a welcome contribution to our trove.
Denny