i have a 66 chevelle did they come with 13 14 15 in blade can someone help thank dave

Looks like 15 inch here. The later cars use 16 inch.

http://www.autopartswarehouse.com/details/QQChevroletQQChevelleQQTricoQQWiper_BladeQQ1964196 7QQTR33150.html?apwcid=P1135867996W43b3f85c7ab9e&gan=1

Napa sells Vintage blades, may not be in the store, probably have to order them.