Your search for "25mm T track slide" revealed the following:
Gooseneck - Sliding with track
$134.50
Riley fully sliding Gooseneck, including slide and track. Slide with 6.3mm shackle pin tack fitting. Boom pin: 9.5mm4.7mm shackle pin on bottom for cunningham purchase.22mm External Track Length: 120mm
Ronstan Sail slide - Internal track
$3.30
Suitable for Keelboat, Dinghy and Trailerable yacht mainsails PNP294 - Sail Slide 19mm (3/4”) WidePNP295 - Sail Slide 22mm (7/8”) Wide
RC7250-INS S25 T-Track, Nylon Insulating Track Insert
$1.40
RC7250-INS S25 T-Track, Nylon Insulating Track InsertSuits Series 19 I-Beam & Series 25 T-Track
Ronstan Sail slide - PNP102 45mm x 8mm
$8.00
Suitable for Keelboat, Dinghy and Trailerable yacht mainsails Sail Slide Stainless Bail 45mm x 8mmWeight (g): 8
Ronstan Sail slide - PNP103 48mm x 11mm
$8.00
Suitable for Keelboat, Dinghy and Trailerable yacht mainsails Sail Slide Stainless Bail 48mm x 11mm
$12.90
Adjustable sail track stop saves your slugs from sliding out while the sail is down. Slug: 12.7mm x 22.5Knurled Nut: 24mm x 10mm
RC7320-INS S32 T-Track, Nylon Insulating Track Insert
$0.80
RC7320-INS S32 T-Track, Nylon Insulating Track InsertSuits Series 32 T-Track & Series 32 I-Beam
Ronstan Sail slide - PNP104 50mm x 12mm
$8.00
Suitable for Keelboat, Dinghy and Trailerable yacht mainsails Sail Slide Stainless Bail 50mm x 12mm
Ronstan Sail slide - PNP291 3/8"
$3.70
Suitable for Keelboat, Dinghy and Trailerable yacht mainsails Sail Slide 9mm (3/8”) Dia.x45mm (1 3/4”)