I just ordered a new 3-slot grille for my '95 R129. I saw it on a guy's who is in England and it really looks great. I got mine off eBay for $199 plus shipping, but if you buy it from the site, it costs $349 but free shipping.

http://cgi.ebay.com/ebaymotors/Mercedes-R129-SL320-SL500-Grille-Grille-91-02-BLACK-AMG_W0QQcmdZViewItemQQcategoryZ33645QQihZ019QQitemZ290144955563

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95 R129
04 Infiniti G35.5 BS
10 X204