Don-Jo 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.
It is my opinion however that one could be relatively easily manufactured and how I would go about doing that would be to purchase three (possibly) of the Hager 336N Latch Adapter Filler Plate as seen here:
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And I would simply cut them so as to accommodate the spacing requirements then simply well did those contain constituent pieces back together - being made of steel that would be very easy work for someone who has the ability to weld.
the only downside of this process would of course be the fact that it would be not available in the chrome plated finish and that you would be relegated to the prime coat available when you have to paint this to match whatever finish requirements for project called for.
This might seem like an extreme solution but knowing our client base oh, there are several people that would be easily capable of this sort of customized project.