it is the same tire for 1969,
is that spare from a '70 Windsor built 340 car?

AY = manufacturing date = 20th week of 1970 (mid-May)
NL = manufacturing plant = Toronto Goodyear plant

here is the website of the manufacturer of reproduction Goodyear tires: KELSEY TIRE up

http://www.kelseytire.com/pages/preformancetires2.html

it looks like F70-14s & G70-14s are available in "white streak", but they show RWL & "red streak" ONLY for E70-14, sounds like it's worth a call callme