I bought new belts to put on my 1969 280SL with A/C. Top mounted Alternator, bottom mounted compressor. The power steering belt fit good, but the alternator belt was 2" too long when pulled out next to the one I'm replacing. Autohaus lists, and sent me a 10X900 belt. Doing some searches on this site I see several different sizes. Anyone have a brand, and belt number they can recommend? Thanks.