Need a fork for a 49cm 2015 Specialized S Works Roubaix SL4

[McLean]

I have purchased a used 49cm 2015 Specialized S Works Roubaix SL4. I need to replace the fork. It appears that the headset bearing config is not standardized; whereby, I need to replace the fork with the exact fork for a 49cm 2015 Specialized S Works Roubaix SL4, rather than an aftermarket fork.

I ask for suggestions/alternatives, as well as where I may find the fork. I have been searching both E Bay & Craig's List with nothing found.

URL for the bike;
https://www.specialized.com/us/en/s-works-roubaix-sl4-disc-di2/p/65438?color=174566-65438

Thanks in advance for your feedback!

Dennis