Flange bolt question

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CRM

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I recently pulled out the crappy dual exhaust someone had previously put in, and I'm planning on going back to the Y pipe and single exhaust piping that the truck came with originally. While pulling the duals I discovered that the passenger side and driver side flange bolts were different lengths. I'm including a picture. My question is: are they actually two different sizes? I've searched all over for an answer but so far I've found nothing. Help me Obi Wan, you're my only hope.

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fast 99

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Right/pass side should have had a heat riser valve.
 

CRM

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It does and it has the longer bolts. Now it makes sense. Thank you brother !!
 

CRM

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Pasco, Washington
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Casey
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1985
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K2500
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350 CI
Another question....How tight do I tighten the nuts on the flange bolts? Until the spring is compressed all the way?
 

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