13 inch 5x4 go larger

Jeff Lemon said
1965 Valiant with 13 inch 5x4 sbp .Would like to go up to 15 inch. Are there adaptors to due or are there 15 inch Steel wheels that are 5x4 sbp ?

Classic industries. Also Coys Wheels out of Utah. I got a set of 15X6 5x4 spokes mags.

http://www.coyswheel.com/coys-c5-1415.html