Thanks Dave,

Looking at the parts fiche, you're right in identifying the part number change which I've always associated with the initiative to reduce weight. The flanged bolts needing wrenches other than 19mm (14 in my recollection) have only surprised me on the rear calipers thus far. My experience, which includes 77,79,83,84,89,90,91,and 93 240s has me only finding the pictured bolt without flange and smooth shank on the front calipers. IPD's picture for 947328 reflects my experience, as does this mess of caliper bolts I've removed or replaced.

When I posted about the '85, I made my own measurements to add to the pic, which were not correct in 2018. Parts fiche describes them as M12 x 31mm. Ellenbrick's question was about the pitch, which is standard M12 pitch 1.75.

Either style bolt will do the job for all years of North American Market 240s which I'm pretty certain all used Girling on the front. Also, I believe the flange you find on the 975546 and some recent replacements for the 947328 is there only to save weight while maintaining the same clamping. So, in the end, it makes no difference to safety or function whether Ellenbrick uses the 975546 or the 947328 bolts shown below.


--
Art Benstein near Baltimore

"No news is good news until you need to know the news" -Tonya Stevens