You should'nt need a manual for any thing that trivial.Think about it.Filter housing is what filter screws on to.Can you find the filter? If so then remove the 3 to 4 13mm bolts that attaches it to the block,scrape off the old gasket,clean the suface,apply new gasket,install housing with the bolts you removed.The Bentley manual is the best offered,if you can'nt seem to repair the car armed w that maybe you should consider letting someone else repair the car. How do you replace oil filter housing gasket(and where is it). E30 Bentley Manual Blows!!