old falcon with two shock tower numbers

[marrog007]

I have a XT Fairmont, and was interested in its origins only to find two shock tower numbers but with one set crossed out with what looks like a row of XX's through it. The one you can read (just) ,does not correspond with the little plate numbers (prefix,serial,sido,model) ,nor does the numbers crossed out. Its a 1968,JG34HL, so i have looked up all these details ,but why would the numbers on the tower not only not match but one set of numbers be crossed out , I am its 3rd owner, last old guy had it shed bound for the last 30 years. Any ideas??Margaret