I think with ours, you can buy the service without the specific job years, but they are about twice as expensive. At least that is what the calculator indicated--if I bought "qualified years" where I worked for the government, which is what my years are, it was about 11000, and if I bought unqualified, it was about 20000. I think.
But confused about whether you buy specific years, like 1981 and 1982 plus others in the 2000's.