I ran into the $200 strut insert issue recently while trying to replace them on my 5/90 735iL as it is pre 7/90. For whatever reason the post 7/90 mounts are able to fit the cheaper and more readily available strut inserts. Rather than do the expensive yellow and blue blistens (which im sure are very nice) I opted to take some compatible strut mounts from a junked 91, 5 series. Everything worked out great but I now have an extra set of pre 7/90 735 strut mounts.

Long story short, this forum has been good to me and if anyone wants/needs them just send me a shipping label.

Thanks all!