1970 Duster base model slant 6 rear differential 2070051 spider kit

Circle pilot-That's an 8 hr drive for me so not out of the question. Normally I would tell the owner it was their problem but I am the builder of this car in the 80's & I feel responsible. Can you confirm the axle width drum to drum 57.5"/ spring pad ctr to ctr 43"? Have you ever had the rear cover off to know the ratio? Google "Axle identification, late 50's through early 80's" & it tells you how to determine ratio without removing the cover. I just have a feeling the kit I bought is not going to fit so that makes your offer my best bet as she can't afford to have one custom made & we just put 4 new smoothies with tires on the car. If I don't get this fixed all she has is a roller. The owner is female age 55- she inherited the car from her father & is a car gal. The car is a 1933 Dodge Rumble Seat coupe & was orig. rodded in the late 40's by a man in Mobile. I bought it in 1972 from behind a shop & rescued it so your rear end would live a long life. I am seriously considering your offer. please advise & thank you. joel If there is someone out there closer with a similar offer please notify. I am 71 I need the shortest drive I can get! But I doubt this deal can be beat & I thank Circle Pilot for the offer. joel