Bopla Alu-Topline Accessories. A range of enclosures accessories from Bopla, compatible with the Alu-Topline series. These accessories will complete your enclosure solution and provide improved protection. Bopla Gasket Seals. These gasket seals will provide ingress protection IP 54. Seal for use with 53.2 mm Alu-Topline enclosure : RS stock no: ; 704-3953 704-3953 - (L/R Gasket 10 x 5 packs) Seal for use with 68.2 mm Alu-Topline enclosure : RS stock no: ; 704-3956 704-3956 - (L/R Gasket 2 x 6 packs). Insulating Strip. Insulating strip for PCB mounting on the profile : RS stock no: ; 704-3975 704-3975. Enclosure Feet. Polyurethane Feet; pack of 4 : RS stock no: ; 704-3978 704-3978. Bopla Alu-Topline Mounting Kits. A selection of Bopla Alu-Topline mounting kits are also available for purchase separately. Length: 150 mm; RS stock no: ; 704-3950 704-3950 Length: 244 mm; RS stock no: ; 704-3962 704-3962 Length: 294 mm; RS stock no: ; 704-3966 704-3966 Length: 194 mm; RS stock no: ; 704-3969 704-3969