Dan,
The machinist called me today and said to me that the top ring had a lot of clearance into the grove,because they are 1.5 mm widht(They are 1/16" but due we are in Spain they talk in mm)
so they would need a 2mm widht ring.

I did a search on the Summit page and found the 5/64" rings wich are pretty similar to 2mm like he said.
Also check the Service Manual,and the specification for the Ring widht is from 0.775" to .0780" wich sounds something like 5/64".

That is why i was thinking that a 5/64 set was going to be what my pistons needed.

I will call to the machinig shop tomorrow and i will ask for the groove widht.
The clearance should be from 0.0015 to 0.003 according to the factory service manual.

Thanks again