I recently set the valve clearances on my 1HZ. I've had the truck for about 45000km and this is the first time that I have set them. I suspect that they weren't done at the 80000km service though as all but one was way out of spec. Most of my inlets had closed to .004" (instead of .008") and exhausts were around .009" (instead of .016"). You can metricize that yourself.
Because so many were out, I removed the camshaft to gain access to the shims. This was straight forward and no major drama. To get the shims out of the bucket, just use a small screwdriver in the base of the slot on the bucket and twist. The oil film holds it pretty securely.
One of the things I didn't have was a shim size-P/N reference so I include it here for your benefit. The shims are marked with a size number only.
Thickness (mm/")
size # P/N
2.35/0.0925
709
13753-17090
2.40/0.0945
704
13753-17040
2.45/0.0965
710
13753-17100
2.50/0.0984
01
13753-54010
2.55/0.1004
42
13753-54420
2.60/0.1024
06
13753-54060
2.65/0.1043
43
13753-54430
2.70/0.1063
11
13753-54110
2.75/0.1083
44
13753-54440
2.80/0.1102
16
13753-54160
2.85/0.1122
45
13753-54450
2.90/0.1142
21
13753-54210
2.95/0.1161
46
13753-54460
3.00/0.1181
26
13753-54260
3.05/0.1201
47
13753-54470
3.10/0.1220
31
13753-54310
3.15/0.1240
48
13753-54480
3.20/0.1260
36
13753-54360
3.25/0.1280
49
13753-54490
3.30/0.1299
41
13753-54410
I don't know if the 1HD-T shims are the same.