@jamesinc has done the Elwood seats and i had been in contact with them to do copies of my V70R seat skins , very professional and helpful.
You used to be able to buy new fake wood trim bits , Berry Motor Group had them in the shop display ages ago and Mark or Graham there can advise and supply on parts for you , actually , my 855R manual wagon in RED tailgate is still in their parts store!! ( crying now.....) OR , get them redone at a place that does the water/paint skin application or vinyl wrap in fake wood. Some even get real wood and make bits too!
Ive got a rear spoiler in Coral Red metallic straight from the paint shop but mounting brackets are not made anymore so a search is needed for used , Mark may have it all at Berrys.
Whatever you can find now that is new old stock , BUY IT as stuff like the plastics are very dry and break on these old cars.
Look on here at Ghettobird and JamesT5-R posts about their aaRsss builds and mods.