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Yep, they're from the US,
Stainless Steel Boat Marine Bilge Vents 8 Raised Louver 2 FER NEW | eBay
They're a 'boat vent bilge' which is what I put into the evilbay search. As expected, the shipping is ridiculous, especially as they're probably made in China.
For those who can, an internet search on something like Alibaba might prove cheaper. I'm sure they must be available here in Oz or NZ. from normal marine shops - the other bonnet vents (on top) pictured look like ones that came up in the search.
Or these:- Boat Vent Bilge Blower Exhaust Louver SEA RAY Marine 17 " Brand NEW | eBay
This one is closest to the look I'm after/have seen somewhere. Needs several of them, nested into each other to make them look like my first pic.- the grey pommy machine with the big cooling fan....:p
Those 'vehicles' came out at various stages with 3, 5 and 6 ports each side. Usually 6 - I picked this one simply 'cos the seller has lots and lots of pics.:D
Cris Craft Brass Deck Vent Scoop 50'S 60'S Boat Marine | eBay
This style is called a Clam Shell Vent, and an ebay search will drop you here:-
clam shell vent | eBay
Hope that helps.
Before you ask, no, I'm too chicken to chop into my Sarah, would do it if I had a spare (cheap) bonnet lid.
Edit:- It always happens... thought I had enough, then found these with FREE shipping !!!!
http://www.ebay.com.au/itm/Whitecap-...ht_1889wt_1148
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Am I the only one holding in a :spudnikhurler: when it comes to bonnet vents? Sorry but not a fan. Each to their own though :D
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[QUOTE=superquag;2135304]
Before you ask, no, I'm too chicken to chop into my Sarah, would do it if I had a spare (cheap) bonnet lid.
But you have a free bonnet for the asking
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Hoist with my own petard.... :D:D:D