This is mostly off the top of my head, but the complete history of Elise wheels in the US is something like this:
The base wheels on the Elise from '05-'10 in the US were the seven spoke cast wheels that you mentioned. They are 16x5.5/17x7.5 and weigh 15.17lbs/20.94lbs.
If you ordered the Sport Pack in '05-'07, that came with forged split-spoke wheels that were the optional forged wheels on the Euro Exige. They are 16x6.5/17x7.5 and weigh 12lbs/14lbs. These were also the standard wheel (in black) on all Exige and Exige S cars other than the Exige S 260 and Exige Cup cars. These always shipped with A048s.
The Sport Pack wheels on the very first few '05s were anodized a nice satin silver, but this process produced too many QA issues so they moved to a flat silver paint until they were able to change the process to paint them with a similar shiny silver/chrome paint to that on the base cast Elise wheels. I believe this switch occurred at the very tail end of '05 production.
In 2006 they added the Black Pack, which included black wheels among other things.
For a period during 2006 the forged wheels were back-ordered from the supplier, so they gave the people who had ordered their cars with the Sport Pack the option of waiting or taking the cast wheels that were standard on the Euro Exige with a credit for the value difference. These are 16x6.5/17x7.5 and weigh 19.4lbs/21.6Lbs. They were also standard on some special editions, such as the California.
In 2007 they added a forged wheel option to the non-Sport Pack cars which consisted of forged split spoke wheels that looked exactly the same as the Sport Pack wheels, but were 6" wide up front instead of the standard 6.5" wide.
The Elise SC, introduced in 2008, moved to a new style cast wheel as standard. They were 16x6/17x8.
In 2008 the Sport Pack on the Elise/Elise SC changed to the 6" wide front wheels and went to AD07s.
Last edited by JWA; 06-28-2011 at 07:25 AM.