Not familiar with the term bottle neck, but many local feed and seeds carried the red torpedo as sets. Have not really looked lately, as plants have become available, sets have drastically lost popularity. Hume sells seed for it.

Here is a link that might be useful: Red Torpedo

Thanks, I checked out the Red Torpedo onion, but that is not it. I did a little more search on the internet (not that I did not do a lot of searching last year) and discovered they are actually called bottle onions or, maybe more appropriately, Amish bottle onions.

I found only one address source for them in Pennsylvania, of course no phone, they are Amish! So I will have to use snail mail to contact them. Hopefully they still have some onion bulbs left. Sure hate to see these old varieties die out.