Actually, there's not much commonality between F/A-18A/B/C/D Hornet and the E/F Super Hornet - they kinda look alike, but that's about it - something like only 20% of parts are the same. Also, the fatigue life of out Hornet airframes is a major issue, so replacement to maintain a number of airworthy airframes was required.
The production line for original Hornets is closed, so only the E/F Super Hornet is purchasable as a complete aircraft, though there are rumours of re-starting production for some critical parts (and that may have happened already).
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