Identical to the originals even.
I contacted the company in Toronto that has the original molds and told them a bunch of us are interested so they made some more. You have to buy from their distributors though.
I ordered from https://performanceimprovements.com
the Canadian distributor and they cost 169.99$ CAD plus tax.
The American distributors are listed on the manufacturers website here: http://www.willpak.com/distributors/
They are special order and the supplier may want a deposit.
No hassle USA order from here: http://www.sfxperformance.com/parts/AST10000.htm
Willpak part number is 10000