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I believe the caps and filler necks on the Cucv is larger than the Civy one. Never had to replace mine yet. See below threads
http://www.steelsoldiers.com/cucv/8654-fuel-cap-replacment-same-civy.html
http://www.steelsoldiers.com/cucv/51993-m1009-locakable-gas-caps.html?highlight=fuel+cap