You will probably have more luck finding a 'Skeet' choke [not Skeet 2 or Improved Skeet] or Improved Cylinder, the two half sizes after plain Cyl. Or the Remington 'Tactical Breacher' which is basically an extended ported Cyl that looks pointy. I'm not sure I have a screw-in Rem Choke in Cylinder myself, but I do have all the others I mentioned, as well as barrels with fixed Cyl bores.
Choke wrenches I got everything from a coin, a blade type, jacknife with choke blade, short handle, T handle, longer handle with a swivel 'speed wrench' (my choice as best)... Some will have a square hole on top to attach a ratchet if your choke is rusted in. Almost any gun store will have *something*.
Many web sites, however, might not list all the plain jane Rem chokes and wrenches they have in-store; it's small potatoes to some. Might be better if you drop in to a local store. Even the Cabela's site ain't got 'em, just the fancy Turkey and expensive duck tubes and such...
I see a bunch of chokes and wrenches on Ellwood Epps, including those I suggested.