Yes pretty sure they will, as military defender had basic squab seats like series vehicle
 
Yes, Series 2 - 3 seats fit military 110/90's.
I fitted a deluxe Series 2-3 seat to my military 110 (the term deluxe is relative), the only problem was that the seat back on the aftermarket seats is made of wood rather than steel, so they are not as robust.
 

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