Ultrarex (8504 + 8505 + 8506 + 8507)
C8504-1 Technic 1999 88 parts 35.3% repair risk Beginner
Ultrarex (8504 + 8505 + 8506 + 8507) (C8504-1) is a LEGO Technic from 1999. The set contains 88 parts across 12 part and colour combinations in 6 colours — the full inventory below shows exactly which pieces you need to build or complete it.
Parts Inventory
| Part | Qty | LEGO price each |
|---|---|---|
 Technic Pin with Friction Ridges Lengthwise and Center Slots 2780 | 6× | Check price → View |
 Technic Axle 2 Notched 32062 | 6× | €0,07 |
 Technic Axle 5 32073 | 1× | Check price → View |
 Technic Bush 1/2 Smooth with Axle Hole Reduced 32123a | 10× | Check price → View |
 Technic Block 3 x 6 x 1 & 2/3 32165 | 2× | Check price → View |
 Technic Gearbox Half 32166 | 2× | Check price → View |
 Technic Rectangular Gearbox Half 32167 | 2× | Check price → View |
 Large Figure Skeletal, Arm Forked with Flexible Center and Ball Joint 32168 | 2× | Check price → View |
 Large Figure Skeletal, Arm Forked with Flexible Center and Ball Joint 32168 | 1× | Check price → View |
![Large Figure Visor / Limb Cover, Armour [Plain]](https://cdn.rebrickable.com/media/parts/elements/4120239.jpg) Large Figure Visor / Limb Cover, Armour [Plain] 32169 | 1× | Check price → View |
 Large Figure Visor / Limb Cover, Armour with Jet / Judge Print 32169pr0007 | 1× | Check price → View |
 Technic Gear Rack Double with Ball Joint 32170 | 1× | Check price → View |
Repairability
Can you fix Ultrarex (8504 + 8505 + 8506 + 8507) if a piece goes missing?
12 of the 34 part+color combinations in this set appear in 3 or fewer sets ever made. Lose one of those and a replacement is very hard to find.
Theme average
6.5%
All sets
6.7%
Hardest to replace
More Technic sets
Browse more LEGO Technic sets related to Ultrarex (8504 + 8505 + 8506 + 8507), including models from 1999 and other sets in the same theme.
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Build DNA
Parts inventory insights for Ultrarex (8504 + 8505 + 8506 + 8507)
88 pieces puts this build -87% against the average Technic set and -54% against the average 1999 release.
Vs average Technic set
Average Technic set: 654 pieces across 453 other sets.
Vs average 1999 set
Average 1999 set: 192 pieces across 144 other sets.
Color profile
Dominant color
Black
Unique parts
1.5 pieces per unique type
Repeat factor
Average pieces per unique type.
Most used part
Technic Axle Connector 2 x 3 with Ball Socket, Open Sides
18xResults are based on official LEGO part inventories. Accuracy improves as you confirm set completeness.
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