There is some kind of Confusion between the "T" (Tubular) Bulbs Names / Nomenclature and I've received some PM's and e-Mails from people asking more info about them, especially Cross-Reference info & Measurements; since I've retrofitted White LED Bulbs on Many instrument Clusters (Not only on Subarus) I made an Easy Pictured Guide, in order to Help you to Understand those "T" Bulbs.
These are the Most Common Bulbs for instrument Clusters:
Here's an Easy Visual comparison Guide:
The Subaru EA82 / GL \ DL or Loyales, only uses the T-5 and the T-10 Wedge Bulbs.
The other Bulbs are here for Reference only.
The Wedge Bulbs Themselves are sold separately from the Sockets, But beside those "Wedge" bulbs, instrument clusters' also Use another kind of Bulbs which comes already Mounted with the Base, those are known as "Neo Wedge" Bulbs and are intended to be non-removable Bulbs ... Despite that you can remove 'em from their bases, those aren't sold separately.
The Neo Wedges are Known as the T3, T4 and T5 and comes either with Long or Short Bases (which could be Black, grey or white) usually are placed behind the Transmission's shifter position numbers on Automatic cars with such display on the instrument cluster. (You know: P, R, N, D, 3, 2, 1)
Short Base LED Neo Wedges:
Long Base Neo Wedges:
I've already retrofitted LED Bulbs on 17 different Cars of many Brands and counting, it started with my own "BumbleBeast" Subaru long time ago, then my Wife's "KiaStein" then my Dad asked me to do that on his Cars, then some Friends who saw my cars at Night asked me to do such retrofitting on their cars and some friends of those friends too... it is the Snow Ball Effect somehow ...
By the way, I had to build my Own Neo Wedge Long Base LED Bulbs (for Kia, Hyundai, etc...), because it was easier for me than to Buy 'em online and wait ... I have to Cut the Base from a Used Neo Wedge Bulb, then remove a Wedge T-5 LED from its base and weld its electrical contacts, the LED Bulb already comes with its resistors; as you can see here:
I also covered one of those I Made, with a Condom-like Green Rubber, in order to Dim a little the Brightness in a 2003 Kia Spectra's instrument Cluster that I Retrofitted onto my Wife's 2000 Kia Sephia (Which also runs with a 2003 Spectra engine) the "KiaStein" ... it is for the "D" (for Drive in a Automatic trans model) Display on the cluster.