1G 1990 Oil Filter Housing Bolts

[KeithAZ]

Are the 90 Oil Filter housing bolts the same length as the 91-94 bolts?

 

[2gmitsueclipse]

According the the cited thread, yes. For 6-bolt engines only.
Thread:
http://www.dsmtuners.com/threads/what-size-is-that-bolt-nut-stud-fastener-1g-version.437697/

TRM Racing also only differentiates between 6 and 7 bolt motors for the OFH bolt kits as well:

https://www.rtmracing.com/xcart/product.php?productid=19714&cat=2762&page=1

I do find a slight discrepancy with the following quote cited from ASA regarding 6-bolt oil filter housings:

Oil filter housing:
For 1990:
MF241266 (washer assembled 8x65)
MF241261 (washer assembled 8x40)
MF241268 (washer assembled 8x75)
MF241264 (washer assembled 8x55)

For 91-92:
MF241261 (washer assembled 8x40) x 2
MF241268 (washer assembled 8x75)
MF241264 (washer assembled 8x55)

 

[X2M7NOZ]

Im fairly certain the 90 OFH is the only one with a different bolt. My 6 bolt has the 90 and that had one bigger bolt instead of the matching 40mm bolts like my 7 bolt and Late gen 6bolt bolt kit has as stated above.

 

[KeithAZ]

Do you know which hole that would go into?