In the UK you can get lower profiles than the 70 series in 13" tyres, but from what I can see they're mainly 60 series tyres. And to get the same diameter as the 185/70 you'll need somewhere around 205/60 (which you can get) and even that's a touch smaller on diameter. As most of you guys know, I went to 15" wheels to get a low profile and better choice of tyres, plus of course more space for larger disc brakes.
This will sound extremely negative but I doubt there's the market to re-introduce the Europa alloy. If you're going after the owner who wants originality then it's the TC & TCS market and on "how many left ?" there were roughly 80 TCS, 90TC cars registered in the UK. (forum member Alex has the lion's share of the TCS
) It's not a big market to go at. International sales would increase that of course, but there's added cost to the buyer and not every restoration is aimed at 100% originality - just look at us lot on this forum !
I can see the desire for a new 13" wheel and I suppose it depends what the minimum production run is required. The price isn't unreasonable (£700/set ?) compared with modern car alloys so that's not a deal breaker, it's just how many folks would buy them. When someone finally re-cast the TC head there was a pent-up demand already, but that head can sell to Lotus Elan/Elan+2/Europa and Ford owners so it's got a much larger market.
In conclusion I really, really DON'T want to pour cold water on anyone for re-introducing parts or supporting our cars, I'm very pleased that someone is even considering the project. What I wouldn't like is to see a stockpile of unsold wheels though, that doesn't help anyone.
Brian