The length dimension of the bases doesn't tell me which type they are since I don't have a pair to compare the length you gave to nor does SAKO's website indicate the differences between length's for the various types. Can you email me or post a pic of the bases?
Here is a link to the web page with pictures of the different bases.
If you don't or can't post a picture, then maybe you can match up your set to the picture and let me know which type yours correspond too - Short or Long. Doesn't sound like you have the Extended type since you only gave one dimension for both of the bases.