Thanks for those pics. I found those wheels posted on Ebay for $30 shipped from Taiwan.

I did some searching on BikeFun and Brompton and actually found some really cool stuff. They have a bracket the replaces the rear fender's mono wheel with a bracket that holds 2 wheels, because as we know, with the single wheel and the bike folded, it tends to be unbalanced. Unfortunately, the site is in Asian characters (Chinese?) and Google Translate wasn't much good at finding the "add to cart" to see what it costs. They also have some really beautiful 5 spoke frame carrier wheels. If anyone has web links to their products, please post them here. Thanks.