Could try trekwood.com and just search for your "year". They seem to have the parts (most of the time). Good luck!
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2015 F350 DRW, 2015 Sequoia SQ38HRL, G614's, Titan Disk Brakes, Trail-Air Flex Air pin box, SRE4000 w/ X-brace, Heavy Duty Shackle Straps w/ Wet Bolts & New Springs.. Now I am done for awhile.
Last Sept I replaced the fabric on the dinette & kitchen slide toppers & found 2 tucked in the slide seal on top of the kitchen slide apparently dropped there during construction. Might be worth a look!
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Danny & Linda
Full-timed 10+ years
Former '13 FB owner
Traded '13 GMC Denali DRW D/A
Currently rv & truckless
Replacement undetermined