In my factory reprint service manual,on page M-5 for a dana 41 rear axle, parts #17& 18 appear (drive pinion leather oil seal gasket & leather oil seal,respectively). Are there any replacements for the leather seal? Obviously hoping to stay away from leather as we all know how that seals?? Looked in one of my aftermarket parts books and these parts arent even listed in rearend blowup. All help is GREATLY appreciated¡¡Mike
