Yeah, many of the later 7-speed frames were 128 or even 130 mm dropout spacing. But you'll need new shifters and new chain and if you need to buy those you could just as easily go 9 or 10-speed. I wouldn't buy 8-speed shifters, 8-speed components are becoming too rare. 9 or 10-speed Shimano cassettes will fit the same hub as 8-speed Shimano.

Al