Drop spindle safety issues

Subject - 1996 GMC 1/2ton ex-cab, 5.7 shortbed.
Here's the problem....
I have a set of 2" dropped spindles that have a axle-shank measurement(rear bearing area) of 1.125".

The OEM spindles have a larger shank measurement of 1.25".

Can these dropped spindles be safely used or do I need the larger shank spindles?
FYI, wheels used have a zero-offset.

It should be fine, as long as they're made by a reputable manufacturer.

Don't know who they're made by. I picked them up at a swapmeet.
There is a raised stamping on the lower-end of the knuckle with "C15", so I am assuming its for full size 1/2 ton truck....right?

I'm not sure man. I believe the C15 was the model name during the '70's. That may be the difference.

i got some free spindles for my last truck, a 1990 standard cab, the spindles were for an extended cab. BIG difference!. had to change rotors, calipers and pads! it cost less than it would have to buy the correct spindles but it was a big headache. but i had heavier duty brakes when i was done though. i think that your going to have to try it out.