9007 bulbs will not fit in place of 9007 bulbs. If the parts place you went to didn't have 9004s you should probably find a different parts place... every US car with single headlamps from ~1985 to ~1995 uses 9004s.

9004 and 9007 lamps have the filaments 90* to each other. Not compatible at all with the fixture designed for the other model lamp.

Please do not install HIDs into your US light fixtures. It will not work properly, you will not be able to see better, and it will blind oncoming traffic.

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.