Can I use 15" wheels on Convertible

[doubleyellow]

I wanted to possibly use 15" Rallye's on my 440 Convertible (came stock with 14" road wheels), but I just found this:

1970 Challenger R/T Tyres
Engine Standard Optional Recommended Brand
383/440 F70 X 14 E60 X 15** Goodyear Polyglas GT
426 Hemi E60 X 15 NONE Goodyear Polyglas GT
** N/A convertible w/440 engine. N/A w/trailer towing package.

Anyone know why 15" not available for 440 engine? Thanks

 

[Avalanche]

You can use 15" with no problem.
I have 17" on my convertible.

 

[doubleyellow]

Cool. But just for information sake, does anyone know why the factory did not offer 15" wheels on 1970 convertibles with 440 engine?
Thanks