That's a casting number that may or may not correspond with the correct replacement part. According to the parts diagram for your motor, 19291A3 is the correct bearing carrier.
This is a commonly-used part across many Merc motors, so there are quite a few of 'em available on eBay. A good used one will save you quite a bit over the very expensive new part:
http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_nkw=19291A3&_sop=15
Here's a brand-new one for about half-price, and you'll note it has the "C1" part number cast into it:
http://www.ebay.com/itm/311246585225
You'd need to press in a new needle bearing (P/N 21700) if you got this one. At least that part is relatively inexpensive!
Be sure to replace the propshaft seals if you get a used carrier. Also renew the bearing carrier O-ring. And you'll probably want to take a hard look at why there was water in the gearcase in the first place. Most common place for leakage is at the driveshaft seals. Followed by the shift shaft penetration. Also check your gearcase drain/fill screws' washers.
I'm wondering what your L/U bearings and gears look like; if it had enough water to have freeze damage, it doesn't bode well for the internal parts.
If your parts are useable, I would retain the reverse gear from your old broken carrier, since it's a matched set and already run-in to the other parts. To remove the reverse gear, use a propane or MAPP torch to rapidly heat up the outside of the aluminum carrier housing, around the bearing. The bearing/gear assy should drop right out. To install in the replacement carrier, heat it up and a lightly-oiled bearing/gear should drop right in.
HTH, let us know how it goes..........ed
