I circled the tab you need to press to get the options. I also circled where the dropdown box is. Press the arrow that poins down and select stretch. Voila,, you should be in business.

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.