The C7 lamp base size is different than the larger old-fashioned Christmas bulb, which is called a C9 and is over three inches long. A C9 does not fit into a candelabra socket, but has its own socket size, which is called intermediate.
Creating a citation for your website in MLA format usually requires you to identify the website author, website title, website publisher, and the date you accessed the information. You'll also need to remember the date you used the website on your bibliography. See some examples here.
In MLA Style, this should include your last name and a page number (i.e. Smith 5) and should be placed in the upper right corner. When done correctly, the page numbers will change automatically on each page and your header will remain on the top of each page even if you shift (cut and paste, insert or delete) the contents of your paper.