My husband is part of the large GLAZIER family from Birz, Lithuania, so perhaps we will find that we are related!
Your question is a little unclear. I am going to answer in two parts.
Part 1 - The overwhelming majority of Kovno Gubernia records for Jews have been indexed by LitvakSIG. They are placed on the All Lithuania Database (https://www.litvaksig.org/all-lithuania-database/ ) or on the JewishGen Lithuanian database (https://www.jewishgen.org/databases/#Lithuania ) The two databases mostly overlap, but sometimes using both helps you search with different tools.
Since you have a group of names, a place, and a date range, you should be searching these databases with different parameters to find your family.
You mentioned that you want to use the Lithuanian Archives - the first thing a Lithuanian archivist will do is search these databases because they helped in their preparation.
It is important to read the information about the database that you are searching. You can find this information by clicking on the link with the name of the record group. You will click on the number of records to see that list of records.
Part 2 - If you mean that you have found your relatives in these databases, but you want to get original documents from the Archives, you need to learn the codes in the last column of the database results - the column labeled "Microfilm/Item; Image; Archive/Fond".
Here is a snippet of the first few births for GLAZ in Kovno Gubernia in the Birth records:
I have marked the last column with a pink line, The first two entries are "Not Filmed", so you would need to write to the Archives for a copy of those. The second two entries have a microfilm number that is underlined on the first line. These microfilm numbers link to the FamilySearch.org website where you can go through the records yourself and find a copy of the original record. You can use the image number as a guide, but it will still require patience and the ability to work with other languages.
The Lithuanian State Archives has a website here:
Information about contacting them for records is on this website. There is also information about the digitization of the Lithuanian Archives and how to find records if you can read Lithuanian. I have not had much success with this, but hope that others will try it and tell me how it works for them.
Peggy Mosinger Freedman
Atlanta, Georgia, USA