Well, if knew anything about addon editing i would make them myself. ;D
You could take a look at Inquisitor's NV Goggles and see if anything there can help you.
I do know to get new NV Goggles in OFP we have to de-pbo the data and data3D pbo's and put the new model and textures there.
The alternative is to make a new soldier model with the googles attached like the BAS pilots but that would make the goggles visible in daytime to.
So i think it's best just to make a new model to replace the ugly old BIS goggles.
here's a link to da Inq goggles, maybe it could be helpfull to see how he has done it.
http://ofp.gamezone.cz/_hosted/inquisitor/addons.htm