My guess is that the air flow is so turbulent it made little/no difference.
However, could you use the winch part to attach a board (plywood or a small aluminum frame, whatever is easier) by sandwiching the spare between it and then attach a diffuser/ partial belly pan?
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1973 Fiat 124 Special
1975 Honda Civic CVCC 4spd
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1981 Kawasaki KZ650 CSR
1983 Kawasaki KZ1100-A3
1986 Nissan 300zx Turbo 5 spd
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