W116, Specialty Tools

I have a question about the "Manual Climate Control Override" kit, specifically about installation of the valve included in the kit. The valve has an arrow on it, apparently indicating flow direction. But there was nothing in the MercedesSource instructions addressing valve orientation. Does it matter which way the coolant flows through the valve?

In the past, I've been able to buy 185/R14 Futura Euro Metric tires at Pep Boys. This is the original size for my 1980 300SD (though lower in speed rating). These tires, made by Cooper, are no longer available. If at all possible, I would prefer to stay with this original size because they are skinny, thus helping keep splashed water and road matter under the fenderwells. They are also less sensitive to minor variations in wheel alignment. Any ideas on where I can get my favorite size 185/R14, any brand?

This is not a question, but rather an additional tip.

I've installed MercedesSource's shift bushing kit on my 1980 300SD, a W116 chassis. The instructions were very good, though I had trouble getting the clips back onto the shifter rod between the two levers. With the shifter rod out of the car and held in my hand, I was amazed at how easy the clips install on each end, but nearly impossible when the shifter rod is inserted into both of its bushings under the car. I thought I'd share how I solved this problem.