There are locating 'dimples' within the frame, 2 on each side, and these correspond to holes in the digitiser frame - they are in different places on the 2 different digitisers, you can file them off the LCD frame and it will fit, then use double sided tape to hold the digitiser to the LCD while you re-assemble the phone. Once the phone is back together the pressure of the casing will hold the digitiser in place firmly.
If they can't give you a straight answer which type it is for I would avoid them :roll:
It may be that they are selling the glass / touchscreen without the frame? Possible but unlikely. Ask for a photo, and if they send the photo that is already on their webpafe definatley don't buy...