I'm still waiting for anyone to tell me what the hub kit I purchased is made for if not for my year model and hp engine I was looking for.
The engine sizes that are listed on the box (Charts) or in the solid hub link by Faztbullet is more for fitment to the gear housing type/size, exhaust flow, prop shaft sizes, and other things that will work together vs full prop type/design... < In the theory of the list is almost a false indicator meaning that it's supposed to or ought to be more about the inner prop hub design for what would work correctly vs not as far as hub types used... Outside looking in, it appears your mileage may be varying here as you mention you made a drop in hub kit work in place of what appears to a solid hub mercury marine prop of the earlier years before Merc designed a prop to accept a drop in Delrin material sleeve 4 cornered design...vs A round design...
But in carefully studying this, there may be more out there than first thought for hub fitments as indicated in the following history of the delrin hub kit link,
https://www.mercurymarine.com/us/en/lifestyle/dockline/the-evolution-of-the-mercury-propeller-hub
The reason you're being questioned would be of past experience is saying the mileage may be sort lived if the 2 different designs were used to make it work? How long is this one going to hold up before it starts to slip again comes to mind.
The following Ebay link is what your prop appears to be using the part numbers provided in which appears solid hubed and possibly a bit older than say your 1999 model engine,
Get the best deals for 48-76228A at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items!
www.ebay.com
The next following link is what each fitment type designs were meant to be used for correctly 'depending on what your prop inside truly looks like,
Can I install a hub kit in my propeller? How to identify whether or not your prop will take a hub kit. Includes: Quicksilver Flo Torq, Michigan Wheel XHS, Solas Rubex, and Powertech. Diagnoses for the following motors: Mercury, Honda, Yamaha, Suzuki, Volvo Penta, Tohatsu and Evinrude.
propshopinc.com
May we ask how you removed your what appears to be solid hub, (Press or hand tools?) ((Easy or hard??)) what did the inside of your prop look like compared to what is being mentioned in the link above? Did you have to press in the Mercury flo torq hub kit with a hydraulic press type or put it in by hand with maybe a slap of a hand type power? All do to design/s in accordance with the fitment link above.
Plus, Should you still find the need to locate a OEM quicksilver rubber hub part number, in the following link, go to table of contents, look for Rubber Hubs page 73 and click the rubber hub to get to page 73 quickly… your part number should be in that area to choose from…