Not sure about the Yakimas, but I have Thules on my '83 300 D and they fit fine. Probably a cross reference chart (I'd guess) between the two. On the off chance that you are going to the Gauley Fest this weekend, then send me a PM and we can compare notes. I'll have my 300 there w/ racks on.

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John Schroader
bio burnin' 83 300D, '83 300 SD, '79 240D
"I've never met a man who was good at making excuses who was good at anything else" Ben Franklin
"You cannot permanently help a man by doing for him what he could and should do for himself" Abraham Lincoln