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Unless somebody has hacked that pipe=to=cat joint, you don't need that flat gasket in the 2nd IPD address. The ring/seal fits between the 2 "bell mouthed" ends and is held compressed in place by 2 Spin Flanges, each having 3 bolt holes — sort of like this crude graphic:
==cat pipe===( () )====front pipe===Non Turbo with 3-hole spin flanges and donut seal/gasket
If your spin flanges are rusted or missing, Volvo makes a replacement that opens up so it can fit over the pipe, similar to the NAPA versions shown below. Volvo PN is 8551977, $7.31 each from Tasca Volvo.
The NAPA (2-bolt) flanges in the pictures (732-1137) were $6.99 in 2006.


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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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