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I cannot find any reference to an L4028 or an L4028C in any of my Honeywell literature.
I suspect that this is a pretty typical fan / limit with the exception of the 3 1/4" insertion. So My best solution is to go with a current Honeywell product like the L4064 series - I don't know if this will be an issue but the shortest insertion is now 1 1/2" then they jump to 5".
I can give you a link to purchase one of those online if you would like, or I can opt out in case another expert has any other suggestions.