Rear leaf spring bumpers something weird going on here?

[GMC"ER]

I am working on my bed and chassis in the rear. I am putting in a rear C-notch kit have one side in but these rear leaf spring bumpers are not right I think? I guess that this is not the standard rearend for this truck, oh sorry it is a 69 GMC stepside with rear leaf. I think that these are not suppose to be there? I see that they are going to interfere with the C-notch as this bumper pad base will hit first losing some axle travel. I am just going to cut them off as they will not be used anymore. Just wanted to know if these were stock? These are on the axle may have been added if stock rearend? I don't know if this is a stock 69 rearend or not? Also in the picture you can see the rear shock mount after I dropped the rear 5" the stock shock was "laying down" more at a slant of course, so I just re drilled my mounting holes and moved it back about 4" it is still inline with the bottom bracket but now at a more strait up position as stock just have to measure for a new shorter shock front and rear. I hope this will work it looked as if it would? Thanks, Robert