Okay, I got my suspension swap done this past weekend and the shock retainer order was pretty easy to figure out once I had an old front and rear shock out. Pictures are rear shock retainers (left) and the front shock retainers (right).
View attachment 1430102
Just comparing the size of the rubber bushings that come with the front and rear shocks, you will realize that the front shocks require the 8 larger retainers. The rear shocks require the 8 smaller retainers. From here, you can almost match them up directly with the stock LX retainers. However, the LX retainers do not have circular openings like the LC retainers (at least mine didn't). The top-most and bottom-most retainers for each shock will be flat. If you look at the picture, you'll see that some of the retainers are "cupped" to maintain their position with the truck's shock mounting surfaces. Anyway, here's the retainer order from top to bottom for my pre-March 1999 LX470 (your mileage may vary). I also included where the bushings and shock mounts are located once assembled (for the learning impaired like myself):
REAR:
90948-02173
BUSHING
90948-02173
SHOCK MOUNT
90948-02170
BUSHING
90948-02173
FRONT:
90948-02174
BUSHING
90948-02176
SHOCK MOUNT
90948-02182
BUSHING
90948-02174
I will take a wild guess and assume that the post-March 1999 100-series trucks require the additional cupped retainer (this would be part number 90948-02184) for the rear shock that attaches to the top of the shock mount (hope that makes sense). Everything else should be similar.