How do I code RTL for specific pages on my bilingual website?

Hello everyone,

I am working on my website which sells both in English and Arabic. So yes, it is another RTL issue.
What I would like to do, is only to have the product pages in RTL, as well as the header (on desktop), and footer. The rest is totally fine as it is.

www.fueler-store.com

can someone please help me with the code?
I would be very thankful!

Cheers,
Fares