The louvres are very difficult to come by, not sure which ones people are using.
I'm not sure if Muzzy on here started to make them though?

Hazel,is there a chance i could have a look at these hardtops or is it all hush hush. I posted before about some yankee ones like on the snorkel  buggy but nobody said about any availible here. My mind is doing overtime in the subconscious about a wooden ones or fibreglass,both pickling it.

Unfortunately we don't have one currently made up to look at.
Maybe you could visit one of the guys who has a hardtop?
http://beachbuggybrummies.co.uk/hardtops/swb-gallery/

As for the "yankee ones" I have no idea about those.

Blimey that took some finding,makes you wonder how you found it in the first place. Berrien buggy is the yankee roof.

Berrien sold up a couple of years ago to a company called ACME Trailers iirc. They took over all of the buggy stuff and have even developed some products.

The Louvres we all used to fit in the Eighties came from a company called Autoplas.

I know a lot of the Current Yanks are still using Louvres, so this may help as a head start to track down who or where they can be obtained

http://www.ebay.co.uk/itm/like/271985826494?adgroupid=13585920426&hlpht=true&hlpv=2&rlsatarget=pla-142413569346&adtype=pla&ff3=1&lpid=122&poi=&ul_noapp=true&limghlpsr=true&googleloc=9046884&device=c&chn=ps&campaignid=207297426&crdt=0&ff12=67&ff11=ICEP3.0.0-L&ff14=122&viphx=1&ops=true&ff13=80