While surfing around, I found this info on RaceBread.com Thanks Carl H
heres what ive found and is aplicable to the rb20/25/26 unless noted.
head studs:
rb20/25 202-4301
rb26 202-4207
rod bolts:
z32 dohc vg30 bolts were reported to work on the rb25/26 but will not work on the rb20 (rod bolts are too long for rod, verify length of rb25/26 botls)
pn for z32 rod bolts 202-6004
use sr20 bolts, may need slight trimming 202-6005 x2 (2 sets req'd if using kit)
or alternatively order (rod bolts and nuts respectively)
12x ar3.67-1
12x n502
rb20 rod bolts ONLY : 202-6003 (l24 late,l26,l28 rod bolts)
main studs:
this is from my measurements of my stock bolts and my block
rb20/25/26 except rb30, again verify lengths and sizes.
3x am4.600-1lb
11x am4.125-1lb
14x 200-8519
14x 300-8344
Carl
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hope this helps - joel