If you are asking me, I got them from this seller on Ebay.
They have cover kits for about 400 shipped, or you can buy the whole seat already done.
I requested the red inserts and he said "sure no problem" and didn't charge any extra for doing them two tone. http://www.ebay.com/itm/BMW-E30-325...ies&hash=item51acccdbb9&vxp=mtr#ht_1792wt_909
I didn't have to buy them though as my Brother in law bought them for me.:D