I have a set or two of the fiberoptic sightes that T/C had installed on their barrels, they fit the Contender barrel contour okay, remember your dealing with 2 different diameters of barrels, but not bad. Now for the problem of mounting the sights, you'll have to drill & tap new holes for the mounting screws as the hole pattern for the mounting screws is different than the Contender. But other than that they should work out fine. I have one set scheduled for a new 8inch 45-70 barrel I got ordered from MGM, not sure what I'll mount the second set on. Got my sights off EBite for less than $25.00 each which included the F/O front sight also. Good luck
Here's a picture of a set mounted on a Contender barrel (Not My Gun
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docand