A/C brackets, were GMC different than Chevy

[ljbear]

I'm only familiar with the 70-72 SBC A/C brackets and was curious if the GMC's would have been different. I went and looked at a 69 GMC parts truck this afternoon that had a 307 and the brackets were quite a bit different. It's a factory A/C, but I suppose it could have been changed at some time. Anyone know, if they were different, and if so, anyone have a picture from a GMC?

Thanks