Pemko has a minimum order requirement. Orders smaller than the required minimum have a longer lead time as we need to consolidate onto a "stock" order. If you need a faster lead time, simply exceed the minimum order amount.
Pemko 318AV 36" Mill Finish Aluminum Specialty Door Bottom with Vinyl insert
I would suggest that you consider an automatic door bottom such as the Pemko SA3 36" Mill Finish Aluminum Automatic Door Bottom as seen here:
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Is it is elegance and will work with a small margin like that and you could even more to sit to the face of your door for a flush installation.