Hi Warhawk. The easiest way is to create your own. Look for M98toBGL in the Scenery Design Utilities section. You can use this to convert 3rd party aircraft into API macros. FS98 designs are ideal as they're less graphics intensive & don't even need to be animated. Not all will convert so this might involve trying several versions of the same aircraft by different designers.

PS. M98toBGL was updated to MDLtoBGL some time ago. This will theoretically convert some FS2000 aircraft but I find the original version easier to use.