I mined a couple of old Hyper Revs for the web addresses for Miata/MX5/Roadster manufacturers, tuners and shops. Thought they might be useful for you guys.
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5zigen
A
A’PEXi
Acre
Alex
Alpha Motorsports
Alterna Racing
Anniversary Racing Factory
APP
ARC
Arena
Arios
Arrive
Arrow Racing Service
Artworks/Dewa
Auto Garage k3
AutoExe
B
Barchetta
Beatrush/Laile
Biot
Blitz
Blood Sports
Bomex
Bride
Brightlogic
Brightning
C
Car Care Office
Car Service Hiro
Carbing/Okuyama
Carrozzeria Japan
Charge Speed
Club Barchetta
Club NA
Corn*s
Craft Square
Cusco
D
D-Technique
D.Speed
Deck Mechanical Power
Defi
Dixcel
Do.Engineering
Dog Fight Pro
Drophead
Ducks-Garden
E
East Bear Sports
Easy Car Workshop
EJ Wing
Endless
Exedy
F
Fatra Styling (Esqueleto)
Fujimura Auto
Fujita Engineering
Fujitsubo
G
Garage 503
Garage AZ Nakazawa
Garage Dog House
Garage Hundred One
Garage I
Garage Kagotani
Garage Kita-Kanto
Garage Ohno
Garage TSR
Garage Vary
Gengen Garage
Glanz
Goda Bankin
GR Craft
H
HKS
HPI
I
I•Styling
Improve Craft Cruise
Itou Jidousha
J
Jet Stream
Jet’s/Integral Kobe
JIC Magic
Joy Fast
Jubiride
JUN
Jupiter-Net
K
K.G. Works
Kakimoto
Ken Auto
Kimura Jidousha
Koyorad
Kyoei Sports
L
Leg Motor Sport
Luck
M
Maruha Motors
Maxim Works
Mazdaspeed
Modern Garage
Monster Sport
Moonface
Murakami Motors
N
Nagisa Auto
Nakamae
Nielex
Nielex
Night Pager
Nopro
O
OAS
Odula
Ogura Racing Clutch
Okada Projects
Olive Ball
Original Box
Osamu Factory
P
Pitcrew Racing
Pivot
Pleasure Racing Service
Polecars
Power Enterprise
Project μ
R
R.S. Aizawa
Racing Garage Blackline
Racing Gear
Ray Bros.
RE-Amemiya
Rev-Limit
Rigid
Roadster Café
Robson Leather
RS Factory Stage
RS Products
Runabout
S
S2 Racing
Saclam
Sard
Shift Sports
Show Up Asahi
Signal Auto
Silk Road
Silver Auto
Soniel Japan
South Corporation Yokohama
Stage22
Stout
Suruga Speed
T
T.O. Racing Factory
Takata
Tanabe
Tanaka Automobile
Tein
Toda Racing
Tomei
Top Secret
Topless Freaks
Trap
Trial
Trust/GReddy
Tuckin99
U
Ultra
US Racing Sports
V
Veilside
Viper
W
Watanabe Wheels
Wing Takeo
Works Bell
Z
Zeigen
Zoom Engineering
I have checked that all of the links work, but haven't been through all of the sites to check that they still stock Roadster parts, so some of these sites may be dead-ends. Let me know if any of the sites are useless or if I have left any major sites off and I will update the list.