The inlet spacing for the Single Bowl RV Bathroom Sink # 37295351 you're looking at is 4" center to center.
I've attached a photo demonstrating this as well as a review video with other specs you can check out.
If you're also needing to replace the faucet I recommend checking out the Phoenix Faucets Catalina RV Bathroom Faucet w/ D-Spud # PF222241 which I'm attaching a review for as well. view full answer...
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