Jim B.,
I switched a old pin style 48" deck to the quick attach mounting. All I did was drill out the front eyes on the deck so the front quick attach eye brackets would fit. In the rear, I had to mount the quick attach pin assemblies. I just layed out where they had to go and drilled the 6 holes to mount them. I used it on my 106 for many years and now have it mounted on my 123 with a quick attach subfdrame. You just have to make sure that you lay the back brackets out correctly for the right distance from the front eyes to the rear pin centers. Also make sure they are centered on the deck properly.
I switched a old pin style 48" deck to the quick attach mounting. All I did was drill out the front eyes on the deck so the front quick attach eye brackets would fit. In the rear, I had to mount the quick attach pin assemblies. I just layed out where they had to go and drilled the 6 holes to mount them. I used it on my 106 for many years and now have it mounted on my 123 with a quick attach subfdrame. You just have to make sure that you lay the back brackets out correctly for the right distance from the front eyes to the rear pin centers. Also make sure they are centered on the deck properly.