Sachs Shocks Number stampings

Hi Guys

I am in the final stages of rebuilding a Swift 89' SE1 . I have some Sachs shocks in good condition which I want to use initially , as they meet our historic/ vintage rules here.



The shocks are stamped thus

#1 250 75 on the body and 042 OH ( on the lower mount)



#2 blank 041 TG ( on the lower mount )



#3 250 70 on the body TG ( on the lower mount)



#4 blank 042 OG ( on the lower mount)





Can anyone kindly explain or interpret these figures . Need a pair to go on the rear.



'89 Swift SE 1