Nigel/Peter,
Many thanks for responding so promptly.
The oil filter housing is for a vertical mounted oil filter, (underneath the housing), as per the #8.8 photo in Chapter 1 on p33 of the Haynes Beta manual.
There is a photo of the engine block mating surface of what I take to be the earlier casting version of the oil filter housing in this listing:
https://www.ebay.it/itm/370741420160Re Nigel`s comments concerning the two oil filter housing gasket types, the two different gaskets have almost the same external and internal dimensions including around the mounting bolt holes, but what I assume to be the filtered oil return hole is nearly double the size in the later version gasket and a different more rectangular shape, without the U shaped cut out next to the upper left mounting bolt. They are quite different in this critical area. The point is that I think I need the later type of oil filter housing casting to match what I assume is the later larger and wider oil return hole at both the oil filter housing mating surface and corresponding engine block mating surface of post 1978 2 litre Beta engines.
I note that Mark Wastnidge also specifies two different oil filter housing gaskets on his Lancia Beta parts website, characterising them as "small hole" and "long hole" versions to suit the two different housing casting versions:
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https://353652584127257704.weebly.com/store/p257/Oil_Filter_Housing_Gasket..html[/url]
Peter do you have any housings that match the mating surface profile of the later (long hole) gasket type? As per this listing:
https://www.midwest-bayless.com/p-25425-4337093-7625510-oil-filter-housing-gasket-dohc-20l-fiat-pininfarina-124-spider-131-brava-lancia-1978-on-new.aspxAnother American Italian car parts seller lists the same two gaskets and says: "Oil Housing to DOHC Block GASKET. Verify footprint against existing housing."
Again, they say that this long hole gasket "Fits: Fiat 124 Spider, Spider 2000 and Pininfarina 1979-1985".
https://www.vickauto.com/parts/oil-filter-housing-gasket-fiat-1242000-1979-85-sku-40-2379/Re alternator brackets, I really just want the original factory supplied alternator bracket arm with the long adjustment slot as the original bracket arm was cut short and a different piece welded on to accept the new alternator location further away from the engine above the air compressor. I was also hoping to reinstate the lower alternator original long bolt and bushing pivot attachment arrangement to the oil filter housing. The original bottom mounting bolt and bushing was again cut and rewelded to accomodate the bigger combined compressor and alternator bottom mounting bracket. It is now useless and can`t be reused, not to mention badly worn. So I need a new bolt and bushing, preferably factory original bushing for ease of fitment. Happy to play around with other bolts/spacers/washers to get the belt alignment right but I need the right bracket to start with. Custom fabricating brackets is far too expensive labour wise unless you do it yourself.