Current high is black on dark yellow, fully embossed. Now with stacked D/I prefix, since serial has advanced beyond 99999. Fully embossed (including the prefix), black on dark yellow.
Issued to new and used auto dealers. DI stands for "Dealer Inventory." Plates can be transferred between dealer-owned vehicles. Lipstick design, with "DEALER" embossed on bottom. Renewed annually in December with validation sticker.
Update: Dealer plates can now expire in any month. The validation sticker has a slightly narrower font than the standard sticker.
As of early 2012, stickers on Dealer plates seem to be using the new standard sticker (which has a wider font than the original stickers with the plate number on the bottom that were introduced in 2001.)
Francis Lapeyre reports that apparently Dealer Inventory plates are now all embossed (no screened lipstick state name like other issues), and are now black over light yellow. LOUISIANA embossed on top, DEALER on bottom, and the usual white month/year validation sticker at the lower right corner. The low for this style is DI64299 spotted on 2012-06-10.
Handicapped Dealer: HD0191 (wheelchair symbol to the left of serial; the HD prefix is embossed full-sized)
Update: These new all-embossed plates are black over dark yellow (not a bright yellow). LOUISIANA embossed on top; DEALER embossed on bottom.
Jim Palmer - 26 Mar ’19