Recently I purchased rear brake drums (Pronto bd88...

Recently I purchased rear brake drums (Pronto bd8839) listed as fitting 1964 Buick Sportwagon. Because I know for a fact front and rear drums are the same I ordered 4. Now I own 4 (expensive) paper weights. Despite numerous attempts to prove their site is wrong, Rockauto insists otherwise.
1/ Photos showing differences between their drums and mine did not help. I have 2 Sportwagons - 8 drums-all the same part #s-all2.5in wide. Bd 8839 drums are for 2in wide brake shoes.
2/ Copy from Sportwagon Service Manual brake page showing they are different from sedans and estate wagons.---Still no joy!
3/ Copy from Buick Club USA magazine detailing the larger drums (and wheel cylinders) you have guessed it--still no comments.
4/ Provided link to Antique Car Club of America members answer to my question for confirmation---he stated front and rear drums are the same (2.5in)
5/ Rockauto said they sold 100+ of these drums for this vehicle (64 Sportwagon) and no fitment problems. Not ONE would have been fitted to a Sportwagon UNLESS they had been fitted with a sedan rear axle assembly. Surely 100+ Sportwagon owners have not done that!!!!
6/ 25 other suppliers of bd8839 state NOT COMPATIBLE WITH 1964 BUICK SPORTWAGON. Perhaps they are all wrong?? Rockauto comment "can't trust Ebay listings".

Ever thought you might as well bang your head against a brick wall??
I also realize that this purchase is well over 30 day time limit for returns etc. ( however shipping heavy items to New Zealand normally takes much longer) and returning them would cost more than the value of the drums. However I think some compensation or a sizable discount on my next order for 4 correct brake drums would be in order.
Now for the good news-----I have purchased numerous parts from Rockauto---no problems and good value. I have also stated that I will continue to support the Company. I have more than a dozen USA built cars and most will need spare parts at some stage.
Regards Bruce.

P.S. Last evening I emailed another supplier of the same drums who also incorrectly listed them as fitting 64 Sportwagon and informed them of their mistake. Within 24 hrs I had a reply thanking me for the correct information.