Makes sense; almost suspected that. Looks like my VIN shows a 160mm supporting ring brake shoe (part no. 34216771429) on realoem, whereas a 335 shows the 185mm one (part no. 34216771430)
Someone in another thread did some cutting and welding to replace the 160 with a 185 shoe. Is there an easier way to change it to a 185mm one?
(The reason is I'm currently thinking about getting a performance brake kit for my rear axle, which seems to require the 185mm shoe.)