I do have the blue aerial, but only because I still had parts from my Sealion I had when I was a kid.
If that doesn't make sense here's what happened:
Here is everything I had left from my original childhood Sealion (the rest is long lost somewhere!!)
Then the other day this lot came up on eBay:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 623wt_1065
Here's the picture if the link goes dead:

- Sealion on eBay.tiff (301.56 KiB) Viewed 259 times
It arrived within one day and looked in pretty good shape!
The Dolphin figure is in fantastic condition (unlike this picture, sorry!)
Put it all together and that's where I am with it now:
Any help appreciated!