Will 72 bbc stands/clamshells work with earlier chassis?

[dibo]

I'm almost ready to drop the bbc into my 69 c10, but still need motor mounts/stands. I've seen a few pairs advertised as "72 only" and wanted to make sure they'll work on my 69 (ie: they were used in "72 only", but work on all 67-72's). Is there any differences in how they mount to the frame? Will I have to drill new holes? Long story short, will they work, or do I need something else? Just making sure before I drop the cash, as I wasn't able to find a clear answer in my searches.

Thanks!