Briggs 12HP Carb for Lawnflite 548 Please

Hi,
New to the forum, hoping for some expert help!
 
I have a pretty old Lawnflite 548 ride on which has been excellent but recently developed rough running and a fuel leak from the carb.  I tried cleaning and a new float,many times, no joy. So given the age I thought why not try a new carb.
 
The engine number is 280707-1028-01 and that gives a carb body part 490473 which I bought from ebay.  It looked to be a good fit until I noticed the choke lever is on the wrong side of the carb body.  There is an obvious recess in the casting on the correct side (outboard), with a hole to tap for the retaining screw, but it's no use because the lever is a press fit and is on the other side.  Very frustrating, even more so when all the carbs I look at online are the same.
 
Can anyone point me toward where I can find the correct part, and its part number?
 
ps: I tried to attach an image, no joy.
 
 

Carb overhaul kit:
 
https://www.ereplacementparts.com/carburetor-overhaul-kit-p-359033.html
 
Personally, I'd try to stick with the OEM carb and fix that.  
Aftermarket, in general, is not as good...
 
.

I'd support and clamp the carb as best as possible in a vise with the jet in question facing upward.
 
Using a hand impact tool (cheap, about $12.00) and a trimmed down bit to fit in the hole,
use that to impact and shock it loose...
 
 
 
.