Apparently GM roller lifters are pretty much stock replacements for each other.  GM has redesigned the lifter for the LS7 and you can pick em up uber cheap.  like $121 bucks.
According to a bunch of LT1 forums they are apparently the hot ticket for OE style roller lifters.
				
			According to a bunch of LT1 forums they are apparently the hot ticket for OE style roller lifters.