What's the difference between your two eBay ads? For roller rockers for a ecotec. One has in title high ratio roller rockers and the other is ultra high ratio roller rockers, there is about a 150 dollar difference.

Please note that Ultra high ratio roller rockers 1.98:1 ratio provide more lift and hence more power gains over the high ratio roller rockers 1.9:1 ratio, Moreover, you may find the complete details by following the below-mentioned links:

Ultra High Ratio Roller Rockers

http://www.maceengineering.com.au/ULTRA-HIGH-RATIO-ROLLER-ROCKERS-FOR-ECOTEC-AND-L67-V6

High Ratio Roller Rockers

http://www.maceengineering.com.au/HIGH-RATIO-ROLLER-ROCKERS-FOR-HOLDEN-ECOTEC-AND-L67-V6