Cat 941 - Adding ROPS/FOPS ??

Hello. Brand new to cat and to this forum. Thank you in advance for any input and advice you all can offer.

I'm looking to purchase a cat 941 (80H1666 - serial #). I had a buddy who is a cat mechanic look it over and he gave it overall a thumbs up for its age and use.

My question is, this particular model does not have ROPS/FOPS on it (I've noticed some of them do, some don't). being very new to using this type of machinery,
I think it might be a good idea add this to this machine. Is...

Cat 941 - Adding ROPS/FOPS ??

Cat 941 - Adding ROPS/FOPS ??