I have the 34RL with the factory ordered slide toppers. When I ordered the trailer the number used for the toppers was 6402; this will get you all three slide toppers. No individual part numbers for the toppers are on the price list that I have. The cost is $993 for the three toppers. These will fit the following models 34RL, 36CKTS, 38CK and 38FB2 for the early 2016 models. You will also need to order the Black A&E awning toppers with metal caps part number 6402-3, if you want the metal wrap.This is an additional charge of $190 each but if ordered from the factory with the slide toppers the cost is $400 total.
Hope this helps?
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67