Here's some listings for that engine for a SPAD VII:
I have a listing of British props, but I couldn't find a match for an SE5A with a 180 Hisso. There are several for 150's and 200's as well as for a Wolsely Viper. It's possible the 180 and 200 listings are the same, or a 150 hub might work. If so, here are some possibilities:
AD 662 D 2400 P 1800 (150 Hisso, SE5 - and actually that's the same pitch and diameter as for the Wolsely, which also fit the SPAD VII)
AB 765 D 2415 P not given (180 HIsso, SE5)
AB 7673 D 2414 P 1710 (Wolsely Viper, SE5A)
And now that I've looked through those listings, I just found this one in a separate list:
AB 767 D 2414 P1710 (180 Hispano Suiza - English Boss, SE5)
So, even though they are all actually pretty close, I would guess that the final one would be the best option.
Here's a picture of an SE5 prop for a 180 built by Curtiss.
I can measure the diameter if you'd like, but I don't know the pitch.
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