You can get them here - carmotorsports.com - or try your local auto parts for the GN or other Buick turbo cars. If you use the Buick hoses you may have to cut the lower hose. The ones from CAR are correct and you get all 4 hoses for $100.
They were made by Gates and I beleive carmotorsports.com had them made and got exclusivity for a year or so (back then charged $159.99 for a set) then Napa had them and also GM ... so all got them from Gates.
Napa had 1 or two of the 4 just recently showing but I know Gates did discontinue them over a year ago ... but must be some out there Napa can find for you guys.
Quality is excellent and fit etc as well so I recommend go get them if you can find them ... they were only $50 or less for all 4 from Napa back then ...
O'Reilly seems to have the upper radiator hose ... Gates 22957 @ $22.99
And one of the two heater hoses ... Gates 19359 but not price listed (not sold online apparently).
So 2 of the 4 seems to still be avalible and per the pictures on their website they look correct.
Napa don't seem to have any of them on-line.
Oh and looking at the Gates web site they only list the above two items I found on the O'Reilly's site and the upper radiator hose got this note "This product has been cancelled. It is available until stocks are depleted.
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